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1.
Objective. To differentiate the MR features of septic versus nonseptic inflamed joints.
Design and patients. Thirty patients were referred for MRI with inflamed joints (19 were subsequently found to be septic and 11 nonseptic). At
1.5 T enhanced MRI five groups of signs related to joint space, synovium, cartilage, bone and peri-articular soft tissue respectively
were assessed and compared between the septic and nonseptic groups.
Results. The prevalence of MRI findings in septic versus nonseptic joints (respectively) was as follows: effusion (79% vs 82%), fluid
outpouching (79% vs 73%), fluid heterogeneity (21% vs 27%), synovial thickening (68% vs 55%), synovial periedema (63% vs 55%),
synovial enhancement (94% vs 88%), cartilage loss (53% vs 30%), bone erosions (79% vs 38%), bone erosions enhancement (77%
vs 43%), bone marrow edema (74% vs 38%), bone marrow enhancement (67% vs 50%), soft tissue edema (63% vs 78%), soft tissue
enhancement (67% vs 71%), periosteal edema (11% vs. 10%). The presence of bone erosions appeared to be an indicator for an
infected joint (P=0.072); coexistence of bone marrow edema slightly improves the significance (0.068). A similar trend was obtained when combining
bone erosions with either synovial thickening, synovial periedema, bone marrow enhancement or soft tissue edema (P=0.075).
Conclusions. The combination of bone erosions with marrow edema is highly suggestive for a septic articulation; the additional coexistence
of synovial thickening, synovial edema, soft tissue edema or bone marrow enhancement increases the above level of confidence.
Similar to conventional radiography, the single sign that appeared to show a significant trend was the presence of bone erosions.
However, no single sign or combination could either be considered pathognomonic or exclude the presence of a joint infection.
Received: 18 February 1999 Revision requested: 6 April 1999 Revision received: 26 July 1999 Accepted: 26 July 1999 相似文献
2.
Magnetic resonance imaging features of allografts 总被引:1,自引:0,他引:1
S. V. Kattapuram M. S. Rosol D. I. Rosenthal W. E. Palmer H. J. Mankin 《Skeletal radiology》1999,28(7):383-389
Objective. To investigate the magnetic resonance imaging (MRI) features of allografts at various time intervals after surgery in patients
with osteoarticular allografts.
Design and patients. Sixteen patients who were treated with osteoarticular allografts and who were followed over time with MRI studies as part
of their long-term follow-up were retrospectively selected for this study. T1-weighted images were obtained both before and
after gadolinium administration along with T2-weighted images. All images were reviewed by an experienced musculoseletal radiologist,
with two other experienced radiologists used for consultation. Imaging studies were organized into three groups for ease of
discussion: early postoperative period (2 days to 2 months), intermediate postoperative period (3 months to 2 years), and
late postoperative period (greater than 2 years).
Results. In the early postoperative period, no gadolinium enhancement of the allograft was visible in any of the MR images. A linear,
thin layer of periosteal and endosteal tissue enhancement along the margin of the allograft was visible in images obtained
at 3–4 months. This enhancement apeared gradually to increase in images from later periods, and appears to have stabilized
in the images obtained approximately 2–3 years after allograft placement. The endosteal enhancement diminished after several
years, with examinations conducted between 6 and 8 years following surgery showing minimal endosteal enhancement. However,
focal enhancement was noted adjacent to areas of pressure erosion or degenerative cysts. All the cases showed inhomogeneity
in the marrow signal (scattered low signal foci on T1 with corresponding bright signal on T2), and a diffuse, inhomogeneous
marrow enhancement later on.
Conclusion. We have characterized the basic MRI features of osteoarticular allografts in 16 patients who underwent imaging studies at
various time points as part of routine follow-up. We believe that the endosteal and periosteal enhancement observed on MRI
during the first few months to 2 years following surgery represents vascular ingrowth and early skeletal repair. The zone
of periosteal enhancement could also include the new bone laid on the surface of the allograft through which the soft tissues
bind to the cortex. The exact reason for the inhomogeneity in the marrow signal, and the diffuse, inhomogeneous marrow enhancement
is not clear. This may represent saponified and/or necrotic marrow fat interspersed with the fibrovascular tissue. The features
noted here should provide radiologists with useful information regarding imaging characteristics they can expect to see in
other allograft replacement patients.
Received: 14 August 1998 Revision requested: 23 October 1998 Revision received: 2 February 1999 Accepted: 22 February 1999 相似文献
3.
Contrast-enhanced fat saturation magnetic resonance imaging for studying the pathophysiology of osteonecrosis of the hips 总被引:6,自引:0,他引:6
We imaged 75 hips in 40 patients using fat saturation technique before and after intravenous injection of contrast (0.1 mmol/kg gadolinium diethylene triamine penta-acetic acid, Gd-DTPA). Eighteen hips in 11 patients were determined to be osteonecrotic, either by pathologic or clinical examination. In the osteonecrotic hips, three distinct patterns of enhancement were found: (I) focal area outlined by brightly enhancing rim (7 hips); (II) diffuse enhancement in the femoral head and neck extending into the femoral shaft (3 hips); and (III) a combination of patterns I and II (8 hips). Our data support the hypothesis that early nontraumatic osteonecrosis is associated with hyperemia and/or an increase in capillary permeability rather than acute devascularization, and that diffuse marrow edema is the initial finding in early nontraumatic osteonecrosis. 相似文献
4.
Subchondral insufficiency fracture of the femoral head: histopathologic correlation with MRI 总被引:5,自引:0,他引:5
Objective. To correlate the magnetic resonance imaging (MRI) features with the histopathologic findings in subchondral insufficiency
fracture (SIF) of the femoral head.
Design and patients. This study was based on a retrospective review of the MRI features and histopathologic findings in seven patients with SIF
who had had total hip replacement.
Results. In all seven cases, MRI showed a bone marrow edema pattern in the femoral head, and a focal low-intensity band beneath the
articular cartilage on some slices (not all) on the T1-weighted images. The shape of the low-intensity band varied: it was
irregular and serpentine in four cases, well-delineated, smooth, and a mirror image to the articular surface in two cases,
and parallel to the articular surface in one case. On histologic examination, the low-intensity band on MRI corresponded to
a fracture line and its associated repair tissue. In all but one case, the band was not visible on T2-weighted or fat suppression
images, and the proximal subchondral portion of the lesion had a homogeneous high signal intensity. This region of high signal
intensity corresponded histopathologically to viable bone and marrow tissue with associated callus, edema, and vascular granulation
tissue.
Conclusions. SIF of the femoral head characteristically demonstrates a low-intensity band on T1-weighted images that corresponds, histopathologically,
to a linear subchondral fracture and its associated repair tissue. In most cases, the subchondral portion of the lesion appears
on T2-weighted images as an area of homogeneously high signal intensity.
Received: 1 June 2000 Revision requested: 17 August 2000 Revision received: 11 October 2000 Accepted: 9 January 2001 相似文献
5.
Yoshioka H Stevens K Hargreaves BA Steines D Genovese M Dillingham MF Winalski CS Lang P 《Journal of magnetic resonance imaging : JMRI》2004,20(5):857-864
PURPOSE: To compare signal-to-noise ratios (S/N) and contrast-to-noise ratios (C/N) in various MR sequences, including fat-suppressed three-dimensional spoiled gradient-echo (SPGR) imaging, fat-suppressed fast spin echo (FSE) imaging, and fat-suppressed three-dimensional driven equilibrium Fourier transform (DEFT) imaging, and to determine the diagnostic accuracy of these imaging sequences for detecting cartilage lesions in osteoarthritic knees, as compared with arthroscopy. MATERIALS AND METHODS: Two sagittal fat-suppressed FSE images (repetition time [TR] / echo time [TE], 4000/13 [FSE short TE] and 4000/39 [FSE long TE]), sagittal fat-suppressed three-dimensional SPGR images (60/5, 40 degrees flip angle), and sagittal fat-suppressed echo-planar three-dimensional DEFT images (400/21.2) were acquired in 35 knees from 28 patients with osteoarthritis of the knee. The S/N efficiencies (S/Neffs) of cartilage, synovial fluid, muscle, meniscus, bone marrow, and fat tissue, and the C/N efficiencies (C/Neffs) of these structures were calculated. Kappa values, exact agreement, sensitivity, specificity, positive predictive value, and negative predictive value were determined by comparison of MR grading with arthroscopic results. RESULTS: The synovial fluid S/Neff on fat-suppressed FSE short TE images, fat-suppressed FSE long TE images, and fat-suppressed three-dimensional DEFT images showed similar values. Fat-suppressed three-dimensional DEFT images showed the highest fluid-cartilage C/Neff of all sequences. All images showed fair to good agreement with arthroscopy (kappa, 0.615 in FSE short TE, 0.601 in FSE long TE, 0.583 in three-dimensional SPGR, and 0.561 in three-dimensional DEFT). Although the sensitivity of all sequences was high (100% in FSE short TE, FSE long TE, and DEFT; 96.7% in SPGR), specificity was relatively low (67.6% in FSE short TE and FSE long TE; 85.3% in SPGR; 58.3% in DEFT). The peripheral area of bone marrow edema or whole area of bone marrow edema on fat-suppressed FSE images was demonstrated as low or iso-signal intensity on fat-suppressed three-dimensional DEFT images. CONCLUSION: Fat-suppressed three-dimensional SPGR imaging and fat-suppressed FSE imaging showed high sensitivity and high negative predictive values, but relatively low specificity. The Kappa value and exact agreement was the highest on fat-suppressed FSE short TE images. Fat-suppressed three-dimensional DEFT images showed results similar to the conventional sequences. 相似文献
6.
股骨头缺血性坏死的CT/MRI特征性表现比较分析 总被引:1,自引:0,他引:1
目的:探讨CT/MRI特征表现在股骨头缺血坏死中的诊断价值.方法:分析和总结60例86髋经临床确诊为股骨头缺血性坏死的影像学资料.全部病例均同期行MRI、CT检查.结果:①18个早期病变中,CT示10个表现骨小梁结构模糊,16个表现单纯高密度硬化;MRI示15个出现骨髓水肿,13个有“线样征”;②68个中晚期病变中,股骨头骨小梁断裂及皮质塌陷,CT 45个,MRI 30个(P<0.01);髋臼病变并骨质疏松,CT 49个,MRI 35个(P<0.01).MRI显示51个关节积液.其他影像学表现两者类似.结论:骨髓水肿,“线样征”是早期股骨头缺血性坏死MRI特征性表现.骨小梁结构模糊、中断、碎裂骨折、皮质塌陷及骨质疏松改变CT优于MRI. 相似文献
7.
Subchondral changes in transient osteoporosis of the hip 总被引:7,自引:0,他引:7
Keita Miyanishi T. Yamamoto Yasuharu Nakashima Toshihide Shuto Seiya Jingushi Yasuo Noguchi Yukihide Iwamoto 《Skeletal radiology》2001,30(5):255-261
Objective. To review the subchondral changes on MR imaging in transient osteoporosis of the hip (TOH) and to consider the pathophysiology.
Design and patients. MR images of 12 hips of 11 consecutive patients with TOH were retrospectively studied. The diagnoses of TOH were confirmed
on the basis of previously published criteria, including decreased bone density of the femoral head and/or neck on radiographs,
bone marrow edema (BME) pattern on MR images, spontaneous resolution of the symptoms and a return to normal radiodensity.
Results. All 12 hips showed a BME pattern in the femoral head and/or neck. Linear patterns of very low signal intensity were identified
on T1-weighted images in the subchondral area within the diffuse low signal intensity area in all 12 hips. On T2-weighted
images, a low signal intensity line was observed in the corresponding area in eight hips only. These linear patterns were
thought to represent subchondral fracture lines.
Conclusions. The presence of a subchondral fracture may be important when considering the pathophysiology of TOH.
Received: 5 April 2000 Revision requested: 11 July 2000 Revision received: 22 January 2001 Accepted: 29 January 2001 相似文献
8.
MR imaging of bone marrow edema and joint effusion in patients with osteonecrosis of the femoral head: relationship to pain 总被引:5,自引:0,他引:5
Huang GS Chan WP Chang YC Chang CY Chen CY Yu JS 《AJR. American journal of roentgenology》2003,181(2):545-549
OBJECTIVE: Our aim was to determine the occurrence of bone marrow edema and joint effusion and their relationship to pain in patients with osteonecrosis of the femoral head on the basis of MR imaging. MATERIALS AND METHODS: There were 71 patients with osteonecrosis of the femoral head based on characteristic radiographic and MR imaging findings. All patients had surgical confirmation of the disease. Both hips were affected with osteonecrosis in 39 patients, whereas only one hip was involved in 31 patients. The last patient underwent an arthroplasty of one hip during the study and had only one hip imaged. We evaluated a total of 110 hips in this study, of which 98 were painful. We staged osteonecrosis of the femoral head, using the classification of Steinberg et al. The 31 unaffected hips served as controls. Bone marrow edema and joint fluid were evaluated on MR images. Bone marrow edema was defined as an ill-defined area of low signal intensity on T1-weighted images with corresponding high signal intensity on T2-weighted or inversion recovery images localizing to the femoral head, neck, and intertrochanteric region. The amount of joint fluid was graded from 0 to 3. RESULTS: The peak of bone marrow edema occurred in stage III disease (72%); its odds ratio was seven times greater than that for stage I osteonecrotic hips. Effusions of a grade greater than or equal to 2 were seen most often in stage III disease (92%), compared with 10% in the control hips. With an effusion, bone marrow edema was 12.6 times greater when the hip was painful than when it was not. CONCLUSION: Both bone marrow edema and joint effusions existed with a peak occurrence in stage III disease. Bone marrow edema seems to have a stronger association with pain than does joint effusion in osteonecrosis of the femoral head. 相似文献
9.
Objective The aim of this study was to describe the magnetic resonance imaging (MRI) features of juvenile psoriatic arthritis (JpsA)
in children in order to facilitate early diagnosis and proper management.
Materials and methods Two pediatric radiologists retrospectively reviewed in consensus a total of 37 abnormal MRI examinations from 31 pediatric
patients (nine boys, 22 girls; age range 1–17 years; mean age 9.4 years) who had a definite diagnosis of JpsA and underwent
MRI. Each MRI was evaluated for synovium abnormality (thickening and enhancement), joint effusion (small, moderate, and large),
bone marrow abnormality (edema, enhancement, and location of abnormality), soft tissue abnormality (edema, enhancement, atrophy,
and fatty infiltration), tendon abnormality (thickening, edema, tendon sheath fluid, and enhancement), and articular abnormality
(joint space narrowing and erosion). The distribution of abnormal MRI findings among the six categories for the 37 MRI examinations
was evaluated. The number of abnormal MRI findings for each MRI examination was assessed. Age at MRI examination and all six
categories of abnormal MRI findings according to gender were evaluated.
Results There were a total 96 abnormal MRI findings noted on 37 abnormal MRI examinations from 31 pediatric patients. The 37 abnormal
MRI examinations included MRI of the hand (n = 8), knee (n = 8), ankle (n = 5), pelvis (n = 5), temporomandibular joint (n = 4), wrist (n = 3), foot (n = 2), elbow (n = 1), and shoulder (n = 1). Twenty-eight diffuse synovial thickening and/or enhancement were the most common MRI abnormality (29.2%). Joint effusion
comprised 22 abnormal MRI findings (22.9%). There were 16 abnormal MRI bone marrow edema and/or enhancement findings (16.7%),
and in seven (7.3%) the edema involved non-articular sites. Soft tissue abnormality manifested as edema and/or enhancement
constituted 14 abnormal MRI findings (14.5%). There were ten MRI abnormalities (10.4%) involving tendons. Articular abnormality
seen as joint space narrowing and/or bone erosion comprised six abnormal MRI findings (6.2%). Most MRI examinations had more
than one abnormal finding (84%). Age at which MRI examinations were performed was not significantly different between boys
and girls. All six categories of abnormal MRI findings were not significantly different between boys and girls.
Conclusion Children with JpsA typically present with more than one abnormal finding on their MRI studies. While synovial abnormality
is the most common MR finding in children with JpsA, multi-focal bone marrow edema and enhancement at both articular and non-articular
sites are also notable findings in children with JpsA. The rate of articular abnormality is much lower in children with JpsA
in comparison to adults with psoriatic arthritis. Our findings suggest that MRI can play a useful role in the diagnosis and
ongoing assessment of this uncommon, though important, pediatric rheumatologic disorder. 相似文献
10.
11.
Purpose. To determine whether T1-weighted magnetic resonance (MR) images can demonstrate response in the marrow of patients with
type 1 Gaucher disease treated with enzyme replacement therapy (ERT) and to determine whether a relationship exists between
liver and spleen volume reductions and visible marrow changes.
Patients. Forty-two patients with type 1 Gaucher disease were evaluated on at least two occasions. Thirty-two patients received ERT.
Of these patients, 15 had a baseline examination prior to the initiation of ERT. The remaining 10 patients did not receive
ERT.
Design. T1-weighted and gradient recalled echo (GRE) coronal images of the femurs and hips were obtained. Concurrently, liver and
spleen volumes were determined using contiguous breath-hold axial gradient-echo images. T1-weighted images of the hips and
femurs were evaluated to determine change or lack of change in the yellow marrow.
Results. Of the 32 patients receiving ERT, 14 (44%) demonstrated increased signal on T1-weighted images suggesting an increase in
the amount of yellow marrow. If only the 15 patients with a baseline examination were considered, the response rate to ERT
was 67%. Using Student’s t-test a highly significant correlation (P<0.005) was found between marrow response and reduction in liver and spleen volume.
Conclusions. Marrow changes in patients receiving ERT can be detected by T1-weighted images. This response correlated with reductions
in visceral volumes (P<0.0005).
Received: 11 April 2000 Revision requested: 18 July 2000 Revision received: 26 July 2000 Accepted: 27 July 2000 相似文献
12.
M. A. Bredella P. F. J. Tirman R. C. Fritz T. K. Wischer A. Stork H. K. Genant 《Skeletal radiology》1999,28(10):567-572
Objective. To investigate the use of MR imaging in the characterization of denervated muscle of the shoulder correlated with electrophysiologic
studies.
Design and patients. We studied with MR imaging five patients who presented with shoulder weakness and pain and who underwent electrophysiologic
studies. On MR imaging the distribution of muscle edema and fatty infiltration was recorded, as was the presence of masses
impinging on a regional nerve.
Results. Acute/subacute denervation was best seen on T2-weighted fast spin-echo images with fat saturation, showing increased SI related
to neurogenic edema. Chronic denervation was best seen on T1-weighted spin-echo images, demonstrating loss of muscle bulk
and diffuse areas of increased signal intensity within the muscle. Three patients showed MR imaging and electrophysiologic
findings of Parsonage Turner syndrome. One patient demonstrated an arteriovenous malformation within the spinoglenoid notch,
impinging on the suprascapular nerve with associated atrophy of the infraspinatus muscle. The fifth patient demonstrated fatty
atrophy of the teres minor muscle caused by compression by a cyst of the axillary nerve and electrophysiologic findings of
an incomplete axillary nerve block.
Conclusion. MR imaging is useful in detecting and characterizing denervation atrophy and neurogenic edema in shoulder muscles. MR imaging
can provide additional information to electrophysiologic studies by estimating the age (acute/chronic) and identifying morphologic
causes for shoulder pain and atrophy.
Received: 5 May 1999 Revision requested: 22 July 1999 Revision received: 28 July 1999 Accepted: 29 July 1999 相似文献
13.
MRI of joint fluid in femoral head osteonecrosis 总被引:3,自引:0,他引:3
OBJECTIVE: To evaluate the relationship between joint fluid, intramedullary pressure (IMP), bone marrow edema, and stages of osteonecrosis of the femoral head (ONFH). MATERIAL AND METHODS: We reviewed the magnetic resonance (MR) images of 28 patients with 40 documented ONFHs. IMP was measured in 16 symptomatic hips. The amount of joint fluid was graded as 0 (no fluid), 1 (fluid <5 mm in width), or 2 (fluid > or = 5 mm in width) adjacent to the entire length of the femoral neck. Associated focal and diffuse bone marrow abnormalities were evaluated. A control group of 29 recruited individuals without symptoms related to hip disease were examined. Follow-up MR images were obtained in four patients (five affected hips) 6-10 months after core decompression. RESULTS:Of the 40 affected hips, the severity of ONFH was divided into stages 0 (n=4), I (n=28), and II (n=8 hips) on MR findings. The correlation of joint fluid to IMP and to the presence of bone marrow edema was poor. The amount of joint fluid correlated significantly with the stage of ONFH. None of the five affected hips showed decreased joint fluid on follow-up MR images. CONCLUSION:The amount of joint fluid correlates well with the stage of ONFH. The amount of joint fluid does not correlate with IMP or bone marrow edema. 相似文献
14.
S. Ehara Daniel I. Rosenthal J. Aoki Kunihiko Fukuda Hideharu Sugimoto Hirokazu Mizutani Kyoji Okada Masahito Hatori Masataka Abe 《Skeletal radiology》1999,28(5):265-270
Objective.To determine whether there is a relationship between the peritumoral edema caused by osteoid osteoma seen on magnetic resonance
(MR) imaging and the patient’s age, duration of symptoms, or location of the lesion. Design and patients. All histologically proven osteoid osteomas seen in our institutions during a 5-year period in patients with known age, gender,
duration of symptoms, and available radiological and MR imaging examinations were included in this study. The extent of the
edema in the bone marrow and extraosseous soft tissue around the nidus of osteoid osteoma on T2-weighted MR imaging were graded
from 1 (nonexistent) to 4 (extensive) by two masked observers. The relationships between the patient’s age, duration of symptoms,
and location of lesions were evaluated by Pearson’s correlation coefficient and analysis of variance. Results.Twenty-seven cases met the inclusion criteria. The observer agreement on grading was good. Patients of 15 years of age or
younger had significantly higher grades than patients older than 15 years. There was a moderate negative linear correlation
between the patient’s age and peritumoral edema. No significant relationship was identified between edema and the duration
of symptoms or the location of lesions. Conclusion. Osteoid osteomas in younger patients tend to be associated with more extensive peritumoral edema.
Received: 13 March 1998 Revision requested: 3 August 1998 Revision received: 12 January 1999 Accepted: 2 March 1999 相似文献
15.
Objective. To determine the postoperative appearance of the plantar fascia on MR imaging after a fasciotomy has been performed, and
to compare the postsurgical appearance of the fascia after an open and endoscopic procedure.<@head-abs-p1.lf>Design and patients. Fifteen asymptomatic volunteers (12 women, 3 men; age range 22–49 years, mean age 33 years) with prior fasciotomies for treatment
of longstanding plantar fasciitis were studied. Fourteen volunteers had a unilateral release and one volunteer had bilateral
releases, allowing for assessment of 16 ankles. Eight fasciotomies were performed through an open incision and eight were
performed endoscopically. The average time between surgery and imaging was 24 months (range 11–46 months). The site of surgery
was established from the operative reports. Proton density (PD)-weighted and T2-weighted images in three orthogonal planes
were obtained on a 1.5-T magnet. In eight studies, T1-weighted sagittal and STIR sagittal images were included. The fascia
in each ankle was assessed for morphology and signal intensity. Perifascial soft tissues and bone marrow were assessed for
edema. Preoperative MR studies were available in five volunteers.<@head-abs-p1.lf>Results. There was no apparent difference in the postoperative appearance of the ankle after an open or endoscopic procedure except
for scar formation in the subcutaneous fat which was common after an open procedure (P<0.05). Three ankles had a gap in the fascia (one open, two endoscopic). The plantar fascia measured a mean of 7.0 mm (range
5–10 mm) at the fasciotomy, and 8.3 mm (range 6–12 mm) at the enthesis. At the fasciotomy, 11 of 13 ankles had an indistinct
deep contour and 9 of 13 had an indistinct superficial contour. At the enthesis, 13 of 16 ankles had an indistinct deep contour
and 6 of 16 had an indistinct superficial contour. Compared with preoperative MR studies there was an average reduction in
the fascial thickness at the enthesis of 14% (range 9–20%), but the thickness at the fasciotomy nearly doubled. No edema was
evident in the fascia, perifascial tissues, deep plantar muscles, or calcaneal bone marrow.<@head-abs-p1.lf>Conclusions. The average thickness of the plantar fascia in asymptomatic volunteers after surgery is nearly 2–3 times that of normal.
While there is increased thickness at the site of surgery, the changes in morphology and signal intensity were most prominent
at the enthesis. The key observation was absence of edema in the fascia and perifascial soft tissues. This baseline information
may be of value when assessing MR studies of symptomatic patients.
Received: 23 March 1999 Revision requested: 19 May 1999 Revision received: 4 June 1999 Accepted: 9 June 1999 相似文献
16.
Articular cartilage of the knee: evaluation with fluctuating equilibrium MR imaging--initial experience in healthy volunteers 总被引:3,自引:0,他引:3
Gold GE Hargreaves BA Vasanawala SS Webb JD Shimakawa AS Brittain JH Beaulieu CF 《Radiology》2006,238(2):712-718
Institutional review board approval and informed consent were obtained for this HIPAA-compliant study, whose purpose was to prospectively compare three magnetic resonance (MR) imaging techniques-fluctuating equilibrium, three-dimensional (3D) spoiled gradient-recalled acquisition in the steady state (SPGR), and two-dimensional (2D) fast spin echo (SE)-for evaluating articular cartilage in the knee. The study cohort consisted of 10 healthy volunteers (four men, six women; age range, 26-42 years). Cartilage signal-to-noise ratio (SNR), SNR efficiency, cartilage-fluid contrast-to-noise ratio (CNR), CNR efficiency, image quality, cartilage visibility, and fat suppression were compared. Cartilage volume was compared for the fluctuating equilibrium and 3D SPGR techniques. Compared with 3D SPGR and 2D fast SE, fluctuating equilibrium yielded the highest cartilage SNR efficiency and cartilage-fluid CNR efficiency (P < .01 for both). Image quality was similar with all sequences. Fluctuating equilibrium imaging yielded higher cartilage visibility than did 2D fast SE imaging (P <. 01) but worse fat suppression than did 3D SPGR and 2D fast SE imaging (P < .04). Cartilage volume measurements with fluctuating equilibrium and 3D SPGR were similar. Fluctuating equilibrium MR imaging is a promising method for evaluating articular cartilage in the knee. 相似文献
17.
Palosaari K Ojala R Blanco-Sequeiros R Tervonen O 《Journal of magnetic resonance imaging : JMRI》2003,18(2):225-231
PURPOSE: To evaluate the diagnostic performance of a newly developed single-scan phase-contrast water-fat imaging technique for fat suppression at 0.23T open magnet, compared to the conventional chemical shift selective fat suppression method at 1.5T, in the detection of experimental articular cartilage lesions. MATERIALS AND METHODS: Sixty regions of 20 knee joint specimens of pigs with artificially created articular cartilage lesions were examined with 0.23T and 1.5T MR scanners. Sagittal fat-suppressed three-dimensional gradient-echo (3D GRE) images, obtained with the phase-contrast method at 0.23T, and fat-suppressed three-dimensional spoiled gradient recalled echo (3D SPGR) images, obtained with a chemical shift selective method at 1.5T, were evaluated. Diagnostic performance was analyzed. The conspicuity of the lesions, the amount of artifacts, and the uniformity of fat suppression were evaluated. The contrast-to-noise (CNR) values of cartilage-to-bone marrow, and cartilage-to-infrapatellar fat were calculated. RESULTS: At 0.23T, sensitivity and specificity were 80% and 95% for partial cartilage lesions (grade 2), and 91% and 100% for full-thickness lesions (grade 3). At 1.5T, sensitivity and specificity were 85% and 95% for grade 2 lesions, and 96% and 97% for grade 3 lesions. No significant difference was detected in the conspicuity of lesions. The uniformity of fat suppression was more constant with 3D SPGR images compared to 3D GRE images. More susceptibility artifacts, derived from the procedure of creating lesions, were detected at 1.5T. The cartilage-to-fat CNRs were significantly higher with high-field images. CONCLUSION: Phase-contrast method for fat suppression at 0.23T is a useful technique in detecting articular cartilage lesions. 相似文献
18.
S. Iwasada Yukiharu Hasegawa Tosiki Iwase Shinji Kitamura Hisashi Iwata 《Skeletal radiology》1999,28(5):251-259
Objective. To assess the ability of bone scintigraphy and magnetic resonance imaging (MRI) to predict the outcome of transtrochanteric
rotational osteotomy (TRO) for osteonecrosis of the femoral head (ONFH). Design. This study was a prospective evaluation of imaging techniques. Patients and methods. MRI and bone scintigraphy were performed on 20 hips in 18 patients at 3 months after TRO. The radiographic findings at 3
months after TRO, and the MRI and bone scintigraphic findings, were compared with the radiographic findings at final follow-up
(mean 39 months). Results and conclusions. On MRI a low-intensity area or a low-intensity band in the new weight-bearing area extending over the acetabular edge on
T1-weighted images was related to the presence of collapse on the radiographs at final follow-up. In hips with an area of
absent activity in the new weight-bearing surface on bone scintigraphy, collapse was seen more frequently on radiographs at
final follow-up than in hips without this feature. Bone scintigraphy was no more specific than radiography in predicting the
outcome after TRO. We consider MRI to be superior to bone scintigraphy in predicting the occurrence of collapse, which is
one of the major short-term problems after TRO.
Received: 22 July 1997 Revision requested: 2 January 1998, 12 October 1998 Revision received: 3 March 1998, 23 December 1998
Accepted: 18 January 1999 相似文献
19.
Faiyaz Alam M. E. Schweitzer Xiao-Xian Li J. Malat Shadid M. Hussain 《Skeletal radiology》1999,28(6):312-317
Objective. To describe the frequency of marrow abnormalities on wrist MR imaging and the MR findings of these various abnormalities.
Design and patients. Five hundred and nineteen patients were studied at 1.5 T. Two observers recorded the presence and location of avascular necrosis,
occult fractures and arthritic edema [focal osteoarthritis, ulnolunate abutment, rheumatoid arthritis, septic arthritis, gouty
arthritis and scapholunate advanced collapse (SLAC)].
Results and conclusion. One hundred and eighty-seven (36%) patients demonstrated marrow abnormalities in the wrist, of which 101 were diagnosed as
arthritis [64 (34%) as focal osteoarthritis, 17 (9%) as ulnolunate abutment, 15 (8%) as rheumatoid arthritis, 2 as septic
arthritis, 2 as SLAC, and 1 as gouty arthritis]. Seventy-two patients had occult fractures and in 27 patients avascular necrosis
was seen. MR imaging can reveal various abnormalities in bone marrow of the wrist when findings on radiography are normal
or equivocal.
Received: 29 May 1998 Revision requested: 8 July 1998 Revision received: 8 December 1998 Accepted: 22 January 1999 相似文献
20.
Rhee H Kim MJ Park YN Choi JS Kim KS 《Journal of magnetic resonance imaging : JMRI》2012,35(2):393-398