排序方式: 共有40条查询结果,搜索用时 31 毫秒
31.
Both multislice computed tomography (CT) and magnetic resonance imaging (MRI) are emerging as methods to detect coronary artery
stenoses and assess cardiac function and morphology. Non-cardiac structures are also amenable to assessment by these non-invasive
tests. We investigated the rate of significant and insignificant non-cardiac findings using CT and MRI. A total of 108 consecutive
patients suspected of having coronary artery disease and without contraindications to CT and MRI were included in this study.
Significant non-cardiac findings were defined as findings that required additional clinical or radiological follow-up. CT
and MR images were read independently in a blinded fashion. CT yielded five significant non-cardiac findings in five patients
(5%). These included a pulmonary embolism, large pleural effusions, sarcoid, a large hiatal hernia, and a pulmonary nodule
(>1.0 cm). Two of these significant non-cardiac findings were also seen on MRI (pleural effusions and sarcoid, 2%). Insignificant
non-cardiac findings were more frequent than significant findings on both CT (n = 11, 10%) and MRI (n = 7, 6%). Incidental non-cardiac findings on CT and MRI of the coronary arteries are common, which is why images should be
analyzed by radiologists to ensure that important findings are not missed and unnecessary follow-up examinations are avoided. 相似文献
32.
The present study investigated angiographic emulation of multislice computed tomography (MSCT) (catheter-like visualization)
as an alternative approach of analyzing and visualizing findings in comparison with standard assessment. Thirty patients (120
coronary arteries) were randomly selected from 90 prospectively investigated patients with suspected coronary artery disease
who underwent MSCT (16-slice scanner, 0.5 mm collimation, 400 ms rotation time) prior to conventional coronary angiography
for comparison of both approaches. Sensitivity and specificity of angiographic emulation [81% (26/32) and 93% (82/88)] were
not significantly different from those of standard assessment [88% (28/32) and 99% (87/88)], while the per-case analysis time
was significantly shorter for angiographic emulation than for standard assessment (3.4 ± 1.5 vs 7.0 ± 2.5 min, P < 0.001). Both interventional and referring cardiologists preferred angiographic emulation over standard curved multiplanar
reformations of MSCT coronary angiography for illustration, mainly because of improved overall lucidity and depiction of sidebranches
(P < 0.001). In conclusion, angiographic emulation of MSCT reduces analysis time, yields a diagnostic accuracy comparable to
that of standard assessment, and is preferred by cardiologists for visualization of results. 相似文献
33.
34.
Dewey M Teige F Schnapauff D Laule M Borges AC Rutsch W Hamm B Taupitz M 《Journal of magnetic resonance imaging : JMRI》2006,23(5):674-681
PURPOSE: To analyze the incremental diagnostic value of a combination of two approaches (free-breathing and breathhold) vs. the sole free-breathing approach to coronary magnetic resonance angiography (CMRA) for detection of significant stenoses. MATERIALS AND METHODS: Thirty patients were consecutively included in this prospective trial. CMRA was performed on a 1.5-T MR scanner (Magnetom Sonata, Siemens) using a balanced steady-state free precession (SSFP) sequence during free-breathing (2.4 x 0.9 x 0.7 mm3). Breathholding acquisitions (3.0 x 1.5 x 0.7 mm3) were only performed in cases in which the quality of free-breathing CMRA precluded assessment. Patients with contraindications to CMRA, claustrophobia, or nonassessable images were not excluded from the assessment of diagnostic accuracy (intention-to-diagnose design). RESULTS: In 60% of all free-breathing coronary acquisitions the image quality was adequate for diagnostic assessment. For the remaining 40% of the cases, breathhold acquisitions were obtained. The sensitivity, specificity, nonassessable rate, and accuracy in identifying main coronary branches with significant stenoses using the combination of both breathing approaches and the free-breathing approach alone were 65% vs. 32%, 73% vs. 53%, 24% vs. 52%, and 71% vs. 46%, respectively (P < 0.001). CONCLUSION: In this consecutive cohort of patients, the combination of free-breathing and breathhold CMRA significantly improved diagnostic accuracy. Nevertheless, even this combination did not reach accuracies sufficient for routine clinical application. 相似文献
35.
Dudeck O Zeile M Andreou D Schnapauff D Pech M Wieners G Ricke J Reichardt P Tunn PU 《Clinical imaging》2011,35(3):178-179
The aim of this study was to identify criteria for nodule characterization on chest computed tomography in patients with soft tissue sarcomas. In 195 patients, a total of 194 benign and 117 malignant subcentimeter lung nodules were retrospectively analyzed according to lesion size, shape, margins, density, and localization. Benign lesions more frequently displayed complex shape and were of ground-glass density (P<.0001, respectively). In contrast, round shape and solid density were more frequently found in malignant lesions (P<.0001, respectively). 相似文献
36.
Marc Dewey Mira Müller Stephan Eddicks Dirk Schnapauff Florian Teige Wolfgang Rutsch Adrian C Borges Bernd Hamm 《Journal of the American College of Cardiology》2006,48(10):2034-2044
OBJECTIVES: We sought to compare left ventricular (LV) function assessed with multislice computed tomography (MSCT), biplane cineventriculography (CVG), and transthoracic echocardiography (Echo), with magnetic resonance imaging (MRI) as the reference standard. BACKGROUND: With the same data as acquired for noninvasive coronary angiography, MSCT enables registration of myocardial function. METHODS: A total of 88 patients (64 men and 24 women) underwent MSCT with 16 x 0.5 mm detector collimation, CVG, and MRI, whereas Echo was retrospectively analyzed in a subset of 30 patients. RESULTS: Regarding the ejection fraction, the agreement was significantly superior for MSCT than for CVG (+/- 10.2% vs. +/- 16.8%; p < 0.001) and Echo (+/- 11.0% vs. +/- 21.2%; p < 0.001). For the end-diastolic and end-systolic volumes, the limits of agreement with CVG (p < 0.001) and Echo (p < 0.001 and p < 0.02, respectively) were also significantly larger than with MSCT. In comparison with MSCT, CVG significantly overestimated the end-diastolic and end-systolic volumes (p < 0.001). Intraobserver analysis of MSCT yielded limits of agreement for ejection fraction (+/- 4.8%), end-diastolic volume (+/- 15.6 ml) and end-systolic volume (+/- 8.0 ml), and myocardial mass (+/- 18.2 g). The accuracy in identifying patients and myocardial segments with abnormal regional function was significantly higher with MSCT (84% and 95%) than with CVG (63% and 90%; p < 0.002 and p < 0.001), whereas MSCT and Echo were not significantly different in identifying patients with abnormal regional function. CONCLUSIONS: Our results indicate that the assessment of global and regional LV function with MSCT is more accurate than with CVG, whereas MSCT is superior to Echo for global function. This suggests that MSCT allows reliable evaluation of global and regional LV function. 相似文献
37.
38.
Powerski MJ Scheurig-Münkler C Banzer J Schnapauff D Hamm B Gebauer B 《European journal of radiology》2012,81(7):e804-e811
Objectives
A survey was conducted to give an overview about the practice of radioembolization in malignant liver tumors by European centers.Methods
A questionnaire of 23 questions about the interventional center, preinterventional patient evaluation, the radioembolization procedure and aftercare were sent to 45 European centers.Results
The response rate was 62.2% (28/45). The centers performed 1000 (median = 26) radioembolizations in 2009 and 1292 (median = 40) in 2010. Most centers perform preinterventional evaluation and radioembolization on an inpatient basis. An arterioportal shunt not amendable to preinterventional embolization is considered a contraindication. During preinterventional angiography, the gastroduodenal artery is embolized by 71%, the right gastric artery by 59%, and the cystic artery by 41%. In case of bilobar disease, yttrium-90 microspheres are infused into the common hepatic artery (14%) or separately into left and right hepatic artery (86%). 33% prefer a time interval between right and left liver lobe radioembolization to prevent radiation induced liver disease. 43% of the respondents do not prescribe prophylactic medication after radioembolization. In case of iatrogenic manipulation to the biliary duct system most centers perform radioembolization with prophylactic antibiotics.Conclusions
Despite standardization of the procedure, there are some differences in how radioembolization of liver tumors is performed in Europe. 相似文献39.
Federico Collettini Mascha Golenia Dirk Schnapauff Alexander Poellinger Timm Denecke Peter Wust Hanno Riess Bernd Hamm Bernhard Gebauer 《Journal of vascular and interventional radiology : JVIR》2012,23(5):618-626
PurposeTo analyze initial experience with computed tomography–guided high-dose-rate brachytherapy (CT-HDRBT) ablation of breast cancer liver metastases (BCLM).Materials and MethodsBetween January 2008 and December 2010, 37 consecutive women with 80 liver metastases were treated with CT-HDRBT in 56 sessions. Mean age was 58.6 years (range, 34–83 y). Treatment was performed by CT-guided applicator placement and high-dose-rate brachytherapy with an iridium-192 source. The mean radiation dose was 18.57 Gy (standard deviation 2.27). Tumor response was evaluated by gadoxetic acid–enhanced liver magnetic resonance (MR) imaging performed before treatment, 6 weeks after treatment, and every 3 months thereafter.ResultsTwo patients were lost to follow-up; the remaining 35 patients were available for MR imaging evaluation for a mean follow-up time of 11.6 months (range 3–32 mo). Mean tumor diameter was 25.5 mm (range 8–74 mm). Two (2.6%) local recurrences were observed after local tumor control for 10 months and 12 months. Both local progressions were successfully retreated. Distant tumor progression (new metastases or enlargement of nontreated metastases) occurred during the follow-up period in 11 (31.4%) patients. Seven (20%) patients died during the follow-up period. Overall survival ranged from 3–39 months (median 18 months).ConclusionsCT-HDRBT is a safe and effective ablative therapy, providing a high rate of local tumor control in patients with BCLM. 相似文献
40.
Carsten Kamphues Daniel Seehofer Federico Collettini Marcus Bahra Peter Neuhaus Peter Wust Timm Denecke Bernhard Gebauer Dirk Schnapauff 《HPB : the official journal of the International Hepato Pancreato Biliary Association》2012,14(12):791-797