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1.
Two-dimensional thick-slice MR digital subtraction angiography for assessment of cerebrovascular occlusive diseases 总被引:2,自引:0,他引:2
Aoki S Yoshikawa T Hori M Ishigame K Nambu A Kumagai H Araki T 《European radiology》2000,10(12):1858-1864
Although spatial resolution of current MR angiography is excellent, temporal resolution has remained unsatisfactory. We evaluated
clinical applicability of 2D thick-slice, contrast-enhanced subtraction MR angiography (2D-MR digital subtraction angiography)
with sub-second temporal resolution in cerebrovascular occlusive diseases. Twenty-five patients with cerebrovascular occlusive
diseases (8 moyamoya diseases, 10 proximal internal carotid occlusions, and 2 sinus thromboses ) were studied with a 1.5-T
MR unit. The MR digital subtraction angiography (MRDSA) was performed per 0.97 s continuously just after a bolus injection
of 15 ml of gadolinium chelates up to 40 s in sagittal (covering hemisphere) or coronal planes. Subtraction images were generated
at a workstation. We evaluated imaging quality and hemodynamic information of MRDSA in comparison with those of routine MR
imaging, non-contrast MR angiography, and X-ray intra-arterial DSA. Major cerebral arteries, all of the venous sinuses, and
most tributaries were clearly visualized with 2D MRDSA. Also, pure arterial phases were obtained in all cases. The MRDSA technique
demonstrated prolonged circulation in sinus thromboses, distal patent lumen of proximal occlusion, and some collateral circulation.
Such hemodynamic information was comparable to that of intra-arterial DSA. Two-dimensional thick-slice MRDSA with high temporal
resolution has a unique ability to demonstrate cerebral hemodynamics equivalent to that of intra-arterial DSA and may play
an important role for evaluation of cerebrovascular occlusive diseases.
Received: 16 November 1999; Revised: 27 June 2000; Accepted: 29 June 2000 相似文献
2.
José Luiz Furtado de Mendon?a Sergio Lopes Viana Flávia Mendes Oliveira Freitas Valter de Lima Matos Maria Angélica de Carvalho Barbosa Viana Renato Faria e Silva Luiz Augusto Nardelli Quaglia Jozephina Gon?alves Guerra 《Journal l'Association canadienne des radiologistes》2008,59(2):61-69
OBJECTIVE: Dysgenesis of the internal carotid artery (ICA) is a broad term comprising hypoplasia, aplasia and agenesis of the vessel. It is a rare anomaly, often clinically silent, that can be confidently diagnosed by means of noninvasive imaging methods. METHODS: After a review of teaching files, 7 patients with unilateral carotid dysgenesis were found, 2 with agenesis of the ICA, 3 with carotid aplasia, and 2 with hypoplasia of the vessel. Computed tomography (CT) and magnetic resonance angiography (MRA) of the brain were performed in all patients, with a complete magnetic resonance of the brain in 3 of them, a CT angiography of the brain in one, and MRA of the cervical arteries in 3. RESULTS: The fetal pattern of arterial circulation was found in 3 patients with agenesis/aplasia of the ICA and the adult pattern was found in 2 patients, being the brain circulation of normal pattern in the patients with hypoplasia of the ICA. Two patients presented signs of reduced flow to the brain hemisphere ipsilateral to the carotid dysgenesis; one of them with an old homolateral brain infarction. CONCLUSION: Far from being just an anatomic curiosity, the dysgenesis of the ICA may have serious consequences if not recognized prior to endarterectomies, carotid ligation or transsphenoidal surgery. As much as one-third of these patients will have intracranial aneurysms as well. The imaging methods, instead being mutually exclusive, are complementary in the evaluation of carotid dysgenesis. 相似文献
3.
We report one patient with agenesis and two with hypoplasia of the internal carotid artery (ICA) from an angiographic series of 1275 consecutive patients. In all three patients, MRI and MR angiography were used to establish the anatomical situation; however, they may not clearly distinguish between hypoplasia and agenesis or acquired stenosis or occlusion of the ICA. In such cases, CT of the skull base may be obtained to clarify matters. In all patients, retrograde flow via a large posterior communicating artery was demonstrated. Single-photon emission computed tomography confirmed both the adequacy of cerebral perfusion and the preservation of vasomotor reactivity. 相似文献
4.
Moyamoya disease and spontaneous internal carotid artery dissections are rare conditions, but both tend to affect young adults
with potentially devastating consequences. A 43-year-old non-Japanese patient presented with neurological symptoms, which,
following carotid Doppler ultrasound and angiography, was labelled as being due to a spontaneous internal carotid artery dissection.
Repeat imaging at 3 months showed normalisation of the carotid Doppler findings which coincided with the formation of „moyamoya”
vessels on the angiogram. This case report illustrates the changes on carotid ultrasound in early moyamoya disease which may
mimic the appearances of an internal carotid artery dissection and demonstrates the change of the spectral Doppler waveform
that occurs with the formation of new vessels at the base of the brain.
Received: 20 August 1998; Revision received: 23 November 1998; Accepted: 23 December 1998 相似文献
5.
Value of MR cholangiography in the evaluation of postoperative biliary complications following orthotopic liver transplantation 总被引:4,自引:0,他引:4
Meersschaut V Mortelé KJ Troisi R Van Vlierberghe H De Vos M Defreyne L de Hemptinne B Kunnen M 《European radiology》2000,10(10):1576-1581
The aim of this study was to describe the spectrum of abnormal biliary findings as seen with magnetic resonance cholangiography
(MRC) in symptomatic patients after orthotopic liver transplantation (OLT). In our study we included 12 consecutive patients
post-OLT who presented with clinical and/or biochemical suspicion of biliary complications. In all patients MRC was performed
on a 1.0-T whole-body magnet and breathhold half-Fourier acquired single-shot turbo spin echo and rapid acquisition with relaxation
enhancement sequences were used. Diagnostic confirmation was obtained with percutaneous transhepatic cholangiography (PTC;
n = 3 patients), endoscopic retrograde cholangiography (ERC; n = 3 patients), or clinical follow-up. A vast array of biliary abnormalities were detected in 11 of 12 patients: high-grade,
obstructive, anastomotic stricture was the most common unique abnormality. Findings consistent with bile duct necrosis, the
second most common abnormality, were accompanied by arterial abnormalities in 2 of 5 patients on subsequent MR- and digital
subtraction angiography. Compared with the findings obtained with direct cholangiography (n = 5 patients), MRC was highly accurate for the detection and characterization of postoperative biliary complications. Compared
with the final diagnosis, which was based on PTC-ERC findings and/or all available clinical data, MRC imaging alone was able
to provide a specific diagnosis in 9 of 12 patients. Magnetic resonance cholangiography is an accurate, time-saving, and non-invasive
imaging modality in the evaluation of post-OLT patients in whom suspicion of biliary complications exists. Although the precise
value of MRA in this patient group requires larger dedicated studies, single session “all-in-one” MR evaluation of both biliary
and arterial system in our series proved to be a substantial benefit in obtaining an accurate and complete diagnosis.
Received: 2 December 1999; Revised: 24 February 2000; Accepted: 24 February 2000 相似文献
6.
Congenital Absence of the Internal Carotid Artery 总被引:2,自引:0,他引:2
Francesco Florio Silverio Balzano Michele Nardella Vincenzo Strizzi Mario Cammisa Vincenzo Bozzini Giuseppe Catapano Vincenzo D’Angelo 《Cardiovascular and interventional radiology》1999,22(1):74-78
We report three cases of congenital absence of an internal carotid artery (ICA), diagnosed incidentally by digital subtraction
angiography. The analysis of the cases is based on the classification of segmental ICA agenesis proposed by Lasjaunias and
Berenstein. Usually the patients with this rare vascular anomaly are asymptomatic; some may have symptoms related to cerebrovascular
insufficiency, compression by enlarged intracranial collateral vessels, or complications associated with cerebral aneurysms.
Diagnosis of congenital absence of ICA is made by skull base computed tomography (CT) scan, CT and magnetic resonance angiography,
and conventional or digital subtraction angiography. 相似文献
7.
A 5-year-old boy with macrocephaly and mental retardation was referred for radiologic evaluation. After cranial CT and MR
imaging, the diagnosis of mural type vein of Galen aneurysmal malformation was established by angiography. Two weeks later,
preembolization angiography revealed complete thrombosis of the malformation. Although it is a very rare event, vein of Galen
aneurysmal malformation may spontaneously thrombose following diagnostic angiography. Possible effects of contrast media on
thrombosis were discussed.
Received: 27 April 1999; Revised: 29 September 1999; Accepted: 28 January 2000 相似文献
8.
Evaluation of distal extracranial internal carotid artery by transoral carotid ultrasonography in patients with severe carotid stenosis 总被引:1,自引:0,他引:1
Kishikawa K Kamouchi M Okada Y Inoue T Ibayashi S Iida M 《AJNR. American journal of neuroradiology》2002,23(6):924-928
BACKGROUND AND PURPOSE: Conventional ultrasonography techniques do not allow visualization of the distal cervical segment of the internal carotid artery (ICA). In a study of patients with severe ICA stenosis, we performed transoral carotid ultrasonography (TOCU) to assess its ability to image this segment of the artery. METHODS: The study participants consisted of 20 consecutive patients who had severe carotid stenosis and who underwent carotid endarterectomy between 1999 and 2000. TOCU, conventional carotid ultrasonography, and cerebral angiography were prospectively performed before and after carotid endarterectomy. RESULTS: In all patients, the distal portion of the ICA could be clearly detected by B mode using TOCU and no plaque was observed. The diameter of the distal portion of the ICA significantly increased after carotid endarterectomy (3.9 +/- 0.5 mm [mean +/- SD]), compared with before (3.5 +/- 0.8 mm), when it was estimated by TOCU (P <.01). In seven patients, the postoperative diameter of the distal ICA increased >10%. The mean increase in the postoperative diameter was estimated to be 15.0 +/- 23.0% by TOCU, which significantly correlated with the findings (23.9 +/- 33.7%) based on cerebral angiography (P <.01). The diameter increased >10% postoperatively in 71% of the patients with the degree of cross-sectional stenosis >95% as shown by carotid ultrasonography and in 86% of the patients whose preoperative diameter was <3.0 mm. CONCLUSION: TOCU provides additional information regarding the characteristics of the distal ICA that can be obtained neither by conventional carotid ultrasonography nor by angiography. 相似文献
9.
García Figueiras R Sousa Escandón A García Figueiras A González Rodríguez AA Pazos González G Armesto Fernández M Lapeña Villarroya JA Pérez Valcárcel J Rey Sanjurjo JL 《European radiology》2000,10(10):1639-1643
Retrovesical masses in men not related to prostatic carcinoma or hyperplasia is an uncommon pathology. Rare masses or unusual
manifestations of those common diseases are a diagnostic dilemma. We review our experience in three unusual retrovesical masses
in men: carcinosarcoma filling a giant bladder diverticulum; cystic prostatic carcinoma; and acquired cystic dilatation of
the seminal vesicle associated with a prostatic carcinoma that obstructed and invaded the vesicle. We report the imaging findings
and review the literature. In our experience, the imaging findings are usually not specific for doing a precise diagnosis
and biopsy procedures are necessary.
Received: 18 October 1999; Revised: 13 March 2000; Accepted: 16 March 2000 相似文献
10.
Bogaert J Kuzo R Dymarkowski S Janssen L Celis I Budts W Gewillig M 《European radiology》2000,10(12):1847-1854
Regular follow-up is required in patients with previous intervention for coarctation of the aorta to detect recoarctation
or aneurysm formation. In this study we describe the findings encountered on routine follow-up exams and we compare the use
of contrast-enhanced 3D MR angiography (CE MRA) with fast spin-echo MRI (FSE) to study the thoracic aorta after previous intervention.
In 51 consecutive patients previously treated for aortic coarctation, 74 MR studies of the thoracic aorta were performed during
a 2-year period using CE MRA and FSE MRI. The thoracic aorta was evaluated for abnormalities of course, caliber, shape, and
pathology of side branches. The CE MRA and FSE MRI studies were evaluated side by side by consensus of two reviewers evaluating
which MR technique depicted the abnormalities of the thoracic aorta the best. Of 74 exams, six clinically important abnormalities
were found: four aneurysms and two restenoses. Two small pseudoaneurysms were missed on the FSE studies. Contrast-enhanced
MRA was judged to visualize aortic abnormalities better than FSE (47 of 74 MR studies) especially for the transverse aortic
arch, coarctation site, left subclavian artery, and aortic arch configuration. For the ascending aorta and distal descending
aorta, CE MRA and FSE performed equally well. Aortic diameters measured at four levels in the first 18 MRI studies showed
no significant differences in diameter when measured by FSE or CE MRA (p = not significant). Clinically important abnormalities, such as aneurysm formation and restenosis, can be present years after
treatment for aortic coarctation. In the regular follow-up of these patients, CE MRA may provide additional diagnostic information
compared with FSE and should be included as part of the routine exam.
Received: 3 April 2000; Revised: 5 July 2000; Accepted: 7 July 2000 相似文献
11.
Three-dimensional respiratory-gated coronary MR angiography (MRA) allowed accurate analysis of the anatomy of the coronary
arteries and their relation to the adjacent anatomic structures in two patients with anomalous origin and proximal course
of the coronary vessels. Together with functional tests, it decisively influenced further therapy.
Received: 16 November 1999; Revised: 4 April 2000; Accepted: 3 May 2000 相似文献
12.
We report on a 46-year-old patient in whom an intracranial dural arteriovenous (AV) fistula, supplied by a branch of the
ascending pharyngeal artery, drained into spinal veins and produced rapidly progressive symptoms of myelopathy and brainstem
dysfunction including respiratory insufficiency. Magnetic resonance imaging studies demonstrated brainstem oedema and dilated
veins of the brainstem and spinal cord. Endovascular embolization of the fistula led to good neurological recovery, although
the patient had been paraplegic for 24 h prior to embolization. This case demonstrates the MRI characteristics of an intracranial
dural AV fistula with spinal drainage and illustrates the importance of early diagnosis and treatment. Even paraplegia may
be reversible, if angiography is performed and the fistula treated before ischaemic and gliotic changes become irreversible.
Received: 25 May 1999; Revised: 25 January 2000; Accepted: 15 February 2000 相似文献
13.
Role of the intra-arterial calcium stimulation test in the preoperative localization of insulinomas 总被引:8,自引:0,他引:8
Chavan A Kirchhoff TD Brabant G Scheumann GF Wagner S Galanski M 《European radiology》2000,10(10):1582-1586
The aim of this study was determination of the significance of the arterial stimulation test with venous sampling (ASVS)
in the preoperative localization of insulinoma. Eleven patients with endogenous hyperinsulinism underwent preoperative transabdominal
US, spiral computer tomography (spiral CT), MRI, endoscopic ultrasound (EUS) as well as angiography (DSA) combined with ASVS.
The results were compared with intraoperative findings, intraoperative ultrasound (IOUS) and histopathology. There were no
complications related to the ASVS test. In 11 patients the tumor could be localized with the various modalities as follows:
US 1 of 11 (9 %), MRI 3 of 10 (30 %), spiral CT 4 of 11 (36 %), EUS 5 of 10 (50 %), DSA 8 of 11 (73 %), and ASVS 10 of 11
(91 %). In 2 patients the tumors were intraoperatively neither palpable nor detectable by IOUS, and consequently the intraoperative
management was governed by information provided by DSA combined with the ASVS test. Ten patients had solitary benign insulinomas
and 1 patient with multiple endocrine neoplasia I had two tumors adjacent to each other in the pancreatic tail. Arterial stimulation
test with venous sampling was the most sensitive preoperative test for regionalizing the insulinoma in our set of patients.
It can be performed safely in the course of a regular DSA examination and may affect intra-operative management in patients
in whom the tumors are not detectable by palpation or IOUS.
Received: 23 June 1999; Revised: 13 January 2000; Accepted: 29 February 2000 相似文献
14.
Magnetic resonance imaging in the assessment of urologic disease: an all-in-one approach 总被引:9,自引:0,他引:9
Verswijvel GA Oyen RH Van Poppel HP Goethuys H Maes B Vaninbrouckx J Bosmans H Marchal G 《European radiology》2000,10(10):1614-1619
The aim of this study was to evaluate an “all-in-one” MR procedure to examine the kidneys, the renal vascular supply and
renal perfusion, and the urinary tract. In 64 patients (58 with urologic disease and 6 healthy volunteers), MR was performed
including: (a) T1- and T2-weighted imaging; (b) 3D contrast-enhanced MR angiography (MRA), including the renal arteries, renal
veins, as well as renal perfusion; and (c) 3D contrast-enhanced MR urography (MRU) in the coronal and sagittal plane. For
the latter, low- and high-resolution images were compared. Prior to gadolinium injection, 0.1 mg/kg body weight of furosemide
was administered intravenously. The results were compared with correlative imaging modalities (ultrasonography, intravenous
urography, CT), ureterorenoscopy and/or surgical–pathologic findings. Visualization of the renal parenchyma, the vascular
supply, and the collecting system was adequate in all cases, both in nondilated and in dilated systems and irrespective of
the renal function. One infiltrating urothelial cancer was missed; there was one false-positive urothelial malignancy. Different
MR techniques can be combined to establish an all-in-one imaging modality in the assessment of diseases which affect the kidneys
and urinary tracts. Continuous refinement of the applied MR techniques and further improvements in spatial resolution is needed
to expand the actual imaging possibilities and to create new tracts and challenges in the MR evaluation of urologic disease.
Received: 27 September 1999; Revised: 20 January 2000; Accepted: 22 May 2000 相似文献
15.
Wetzel SG Haselhorst R Bilecen D Lyrer PA Seifritz E Bongartz G Radue EW Scheffler K 《European radiology》2001,11(2):295-302
The application of a contrast-enhanced, two-dimensional MR technique, which provides dynamic projection angiograms at a subsecond
temporal frame rate for depiction of the cervical and intracranial arteries, was evaluated in three healthy volunteers and
seven patients with various cervicocranial steno-occlusive diseases. Intra-arterial digital subtraction angiography (DSA)
served as standard of reference for findings in the patients. Magnetic resonance projection angiography (MRPA) was performed
on a standard 1.5-T clinical MR imaging system at intravenous injection of a single dose of contrast agent (0.1 mmol/kg GdDTPA-BMA).
Sixty consecutive images of the cerebral circulation were acquired at a temporal frame rate of 900 ms per image in the coronal
plane. The collateral flow and the perfusion of the compromised vessel territory were readily assessed by MPRA in patients
with occlusion of the internal cerebral artery (ICA) or middle cerebral artery (MCA). The leptomeningeal collateralisation
of these patients was displayed in a dynamic fashion. Furthermore, quantitative perfusion measurement provided a difference
between both MCA territories in the time to peak (ΔDTTP) of the contrast bolus of 1.12 ± 0.28 s in five patients with severe
stenosis or occlusion of the ICA (healthy volunteers 0.19 ± 0.05 s). However, important pathological findings, such as the
evaluation of carotid artery stenoses and the intracranial collateral flow pattern in patients with severe carotid stenoses,
were not sufficiently assessable as compared with DSA. We conclude that the possibility of obtaining simultaneously information
about morphology and perfusion dynamics of the cervicocranial vessels is unique in MPRA as compared with other MR techniques.
However, in the applied form, the technique is not a reliable tool for the complete evaluation of the cervicocranial vessels
in patients with steno-occlusive disease.
Received: 27 January 2000/Revised: 11 July 2000/Accepted: 13 July 2000 相似文献
16.
We report a rare case of bilateral hypoplasia of the internal carotid arteries with an associated aneurysm of the basilar tip, studied by CT angiography, MR angiography and digital angiography. The patient became symptomatic with an episode of loss of consciousness, likely due to reduced blood perfusion. The other 20 reported cases of bilateral carotid hypoplasia (only four of which with an associated aneurysm) are reviewed. The findings of noninvasive procedures (including narrowing of the carotid canals on CT) may lead to a correct diagnosis before angiography is performed; they may also help to differentiate angiographic narrowing of the hypoplastic internal carotids from the string sign often observed in some acquired conditions. 相似文献
17.
Arbab AS Nishiyama Y Aoki S Yoshikawa T Kumagai H Araki T Nagaseki Y Nukui H 《European radiology》2000,10(7):1056-1060
A new technique, simultaneous display of magnetic resonance angiography (MRA) and multiplanar reconstruction (MPR), was performed
by a workstation to identify the involved vessels in patients with trigeminal neuralgia (TN) or hemifacial spasm (HFS), and
the results were compared with those of oblique sagittal MRI technique. Twelve patients with either HFS or TN were prospectively
assessed by simultaneous display of MRA and MPR, and oblique sagittal techniques, to point out the neurovascular compression
and to identify the involved vessels. Three-dimensional (3D) time-of-flight (TOF) spoiled gradient-echo (SPGR) images were
acquired to create MRA and MPR. Oblique sagittal views were also created and displayed on films. A total of 15 vessels in
12 patients were identified as compressing vessels during surgery. Simultaneous display of MRA and MPR technique pointed out
the presence of vessels at and/or around root entry/exit zone (REZ) in all 12 patients, but proper identification by the name
of the individual vessel was correct in 13 of 15 cases. However, oblique sagittal technique indicated the presence of vessels
at and/or around REZ in 11 patients, but only 8 of 14 vessels were correctly identified. Our new method, simultaneous display
of MRA-MPR, facilitated correct identification of the involved vessels compared with the oblique sagittal view method.
Received: 30 June 1999; Revised: 9 September 1999; Accepted: 23 November 1999 相似文献
18.
目的 初步应用MR血管影像结合计算机三维图像后处理技术测量和分析在体颈动脉分叉的几何学属性指标,探讨不同年龄组该段血管形态的差异.方法 搜集2005年至2007年经超声检查或DSA检查证实为颈动脉分叉正常或狭窄率小于30%的受检者57例,分为≤40岁组27例和>40岁组30例,行颈动脉1VIR增强血管成像(CEMRA)检查,扫描所得减影图像经计算机图像后处理重建三维血管图像并测量颈动脉分叉的各项几何学指标.采用嵌套设计方差分析方法分析两组的各项测量指标的差异是否有统计学意义.结果 >40岁组和≤40岁组的颈动脉分叉几何学指标分别为:分叉角:70.268°±16.050°和58.857°±13.294°,颈内动脉(ICA)角:36.893°±11.837°和30.275°±9.533°,ICA非平面角:6.453°±5.009°和6.263°±4.250°,颈总动脉(CCA)曲率:0.023±0.011和0.014±0.005,ICA曲率:0.070±0.042和0.046±0.022,ICA/CCA直径比:0.693±0.132和0.728±0.106,颈外动脉(ECA)/CCA直径比:0.750±0.123和0.809±0.122,ECA/ICA直径比:1.103±0.201和1.127±0.195;分叉面积比:1.057±0.281和1.291±0.252.>40岁组和≤40岁组的分叉角、ICA角、CCA曲率、ICA曲率、ECA/CCA直径比和分叉面积比的差异有统计学意义(F值分别为17.16、11.74、23.02、13.38、6.54、22.80,P值均<0.05).结论 应用MR血管成像结合图像后处理方法实现了在体颈动脉分叉的三维立体重组和其各项几何学指标的测量,为进一步分析血管几何形态与血流动力学状态的关系以及其与动脉粥样硬化病变的发生与发展提供了一种崭新而简便易行的技术. 相似文献
19.
Feasibility of synchrotron radiation computed tomography on rats bearing glioma after iodine or gadolinium injection 总被引:2,自引:0,他引:2
Le Duc G Corde S Elleaume H Estève F Charvet AM Brochard T Fiedler S Collomb A Le Bas JF 《European radiology》2000,10(9):1487-1492
The purpose of this work was to demonstrate the feasibility of a new imaging technique called synchrotron radiation computed
tomography (SRCT). This technique leads to a direct assessment of the in vivo concentration of an iodine- or gadolinium-labeled
compound. Rats bearing C6 glioma were imaged by MRI prior to the SRCT experiment. The SRCT experiments were performed after
a 1.3 g I/kg (n = 5) or a 0.4 g Gd/kg (n = 5) injection. Finally, brains were sampled for histology. The SRCT images exhibited contrast enhancement at the tumor location.
Ten minutes after injection, iodine and gadolinium tissular concentrations were equal to 0.80 ( ± 0.40) mg/cm3 and 0.50 ( ± 0.10) mg/cm3, respectively in the peripheral area of the tumor (respective background value: 0.20 ± 0.02 to 0.10 ± 0.01). Correlation
to MRI and histology revealed that the contrast uptake occurred in the most vascularized area of the tumor. The present study
summarizes the feasibility of in vivo SRCT to obtain quantitative information about iodine and gadolinium-labeled compounds.
Beyond brain tumor pathology, the SRCT appears as a complementary approach to MRI and CT, for studying iodine- and gadolinium-labeled
compounds by the direct achievement of the tissular concentration value in the tissue.
Received: 8 September 1999; Revised: 3 May 2000; Accepted: 4 May 2000 相似文献
20.
Electrical impedance measurement of the breast: effect of hormonal changes associated with the menstrual cycle 总被引:13,自引:0,他引:13
The purpose of this study was to evaluate the influence of hormonal factors on electrical impedance measurement with a new
device TS2000, which is a new method in diagnosis of breast disease. Twenty-one healthy pre-menopausal women volunteers (aged
24–39 years) were examined with the TS2000 once/week for two menstrual cycles. On average, at least one spot was present in
47 % of images of women not taking oral contraceptives and in 44 % of women taking oral contraceptives (OC). The number of
spots varied over the menstrual cycle and had a maximum in week 3 and week 5. We found that after 1 week only 15 % of spots
were present and no spots persisted for three consecutive weeks. These data, if further supported by observations on other
populations of women, show that false-positive results are common in pre-menopausal women; however, these false-positive spots
do not persist for long periods of time. This information may provide a basis for discrimination between true-positive and
false-positive spots on the TS2000 image, since the latter would be expected to disappear on short-term follow up.
Received: 31 January 2000; Revised: 22 May 2000; Accepted: 24 May 2000 相似文献