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Jiang C, Lin P, Fu X, Shu J, Li H, Hu X, He J, Ding M. Three-dimensional contrast-enhanced magnetic resonance angiography for anterolateral thigh flap outlining: A retrospective case series of 68 patients. Exp Ther Med 2016; 12:1067-1074. [PMID: 27446322 DOI: 10.3892/etm.2016.3387] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Accepted: 07/14/2015] [Indexed: 11/06/2022] Open
Abstract
Flap transfer is increasingly used for repairing limb defects secondary to trauma or tumor, and appropriate preoperative planning plays a critical role. The present study aimed to examine the use of three-dimensional (3D) contrast-enhanced magnetic resonance angiography (CE-MRA) in evaluating the blood supply distribution and perforating branch pattern of anterolateral thigh (ALT) flaps. Bilateral donor lower limbs were scanned in 68 patients (136 limbs) using a Siemens Avanto 1.5 T magnetic resonance imaging scanner with a 3D fast low-angle shot sequence, following the thin-slab maximum intensity projection (TS-MIP) technique. The lateral femoral circumflex artery (LFCA) was visualized in all patients: 101 limbs (101/136, 74.3%) were type I; 20 limbs (20/136, 14.7%) were type II; 3 limbs (3/136, 2.2%) were type III; and 12 limbs (12/136, 8.8%) were type IV. Tertiary branches were identified in 94 limbs (94/136, 69.1%). Donor flaps were outlined according to MRA TS-MIP findings in 4 patients. All flaps survived uneventfully following the transfer. In donor flap outlining, 3D CE-MRA with the TS-MIP technique allowed an accurate, direct visualization of the branching pattern and distribution profile of the LFCA supplying the ALT flap.
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Affiliation(s)
- Chunjing Jiang
- Department of Radiology, Jinhua Municipal Central Hospital, Jinhua, Zhejiang 321000, P.R. China
| | - Ping Lin
- Department of Hand-Foot Surgery, Jinhua Municipal Central Hospital, Jinhua, Zhejiang 321000, P.R. China
| | - Xiaoyan Fu
- Department of Medical Sciences, Jinhua College of Profession and Technology, Jinhua, Zhejiang 321007, P.R. China
| | - Jiner Shu
- Department of Radiology, Jinhua Municipal Central Hospital, Jinhua, Zhejiang 321000, P.R. China
| | - Huimin Li
- Department of Radiology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, P.R. China
| | - Xiaogang Hu
- Department of Hand-Foot Surgery, Jinhua Municipal Central Hospital, Jinhua, Zhejiang 321000, P.R. China
| | - Jianrong He
- Department of Radiology, Jinhua Municipal Central Hospital, Jinhua, Zhejiang 321000, P.R. China
| | - Mingxing Ding
- Department of Medical Sciences, Jinhua College of Profession and Technology, Jinhua, Zhejiang 321007, P.R. China
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Hansmann J, Michaely HJ, Morelli JN, Luckscheiter A, Schoenberg SO, Attenberger UI. Enhancement characteristics and impact on image quality of two gadolinium chelates at equimolar doses for time-resolved 3-Tesla MR-angiography of the calf station. PLoS One 2014; 9:e99079. [PMID: 24893292 PMCID: PMC4043962 DOI: 10.1371/journal.pone.0099079] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 05/10/2014] [Indexed: 11/18/2022] Open
Abstract
PURPOSE To compare enhancement characteristics and image quality of two macrocyclic gadolinium chelates, gadoterate meglumine and gadobutrol, in low-dose, time-resolved MRA of the calf station. MATERIALS AND METHODS 100 consecutive patients with peripheral arterial disease (stages II-IV) were retrospectively analysed. Fifty patients were included in each group - 32 men and 18 women for gadobutrol (mean age 67 years) and 34 men, 16 women for gadoterate meglumine (mean age 64 years). 0.03 mmol/kg bw of either gadobutrol or gadoterate meglumine was injected. Gadobutrol was diluted 1 ∶ 1 with normal saline (0.9% NaCl) to provide similar injection volume and bolus geometry compared to the undiluted 0.5 M dose of gadoterate meglumine. Signal-to-noise-ratio (SNR), contrast-to-noise-ratio (CNR) and image quality were analysed and compared between the two groups. RESULTS Mean SNR ranged from 83.0 ± 46.7 (peroneal artery) to 96.4 ± 64.5 (anterior tibial artery) for gadobutrol, and from 37.6 ± 13.8 (peroneal artery) to 45.3 ± 16.4 (anterior tibial artery) for the gadoterate meglumine group (p<0.0001). CNR values ranged from 30.1 ± 20.1 (peroneal artery) to 37.6 ± 26.0 (anterior tibial artery) for gadobutrol and from 14.9 ± 8.0 (peroneal artery) to 18.6 ± 16.4 (anterior tibial artery) for gadoterate meglumine (p<0.0001). No significant difference in image quality was found except for the peroneal arteries (p = 0.006 and p = 0.04). Interreader agreement was excellent (kappa 0.87-0.93). CONCLUSION The significantly better enhancement as assessed by SNR and CNR provided by gadobutrol compared to gadoterate meglumine does not translate into substantial differences in image quality in an equimolar, low-dose, time-resolved MRA protocol of the calves.
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Affiliation(s)
- Jan Hansmann
- Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim – Heidelberg University, Mannheim, Germany
| | - Henrik J. Michaely
- Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim – Heidelberg University, Mannheim, Germany
| | - John N. Morelli
- The Russel H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins Hospital, Baltimore, Maryland, United States of America
| | - André Luckscheiter
- Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim – Heidelberg University, Mannheim, Germany
| | - Stefan O. Schoenberg
- Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim – Heidelberg University, Mannheim, Germany
| | - Ulrike I. Attenberger
- Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim – Heidelberg University, Mannheim, Germany
- * E-mail:
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Asbach P, Meade MD, Sattenberg RJ, Klessen C, Huppertz A, Heidenreich JO. Continuously moving table aorto-iliofemoral run-off contrast-enhanced magnetic resonance angiography: image quality analysis in comparison to the multistep acquisition. Acta Radiol 2014; 55:266-72. [PMID: 24078458 DOI: 10.1177/0284185113498535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Optimal vessel contrast is a prerequisite for vascular imaging. Consecutive stationary imaging of multiple fields of view is contrary to the continuous contrast material passage through the vascular tree. A continuous acquisition of a magnetic resonance (MR) sequence might overcome this limitation. PURPOSE To investigate the image quality of a continuously moving table (CMT) acquisition compared with the established multistep approach for contrast-enhanced magnetic resonance angiography (CE-MRA) of the aorto-iliofemoral run-off. MATERIAL AND METHODS Institutional review board approved this retrospective interindividual study of 60 consecutive patients referred to CE-MRA for peripheral arterial disease. Thirty patients underwent CE-MRA using the routine multistep acquisition and 30 patients were scanned using the CMT technique at 1.5 Tesla. All patients received a fixed contrast dose of 25 mL gadoterate meglumine. A quantitative analysis was performed to assess the relative contrast of 10 vascular segments from the proximal abdominal aorta to the distal calf arteries. A qualitative evaluation of three separate vascular regions (abdomen and pelvis, thighs, and calves) was performed. Two radiologists graded independently arterial vessel conspicuity, venous contamination, presence of artifacts, and diagnostic confidence on a 4-point scale. Overall scan time, including all localizer scans, was recorded. Statistical differences were tested using the Wilcoxon signed-rank test with Bonferroni correction. RESULTS No significant differences were found between the continuously moving table acquisition and the multistep acquisition with regard to the relative vascular contrast and the qualitative image criteria. The agreement between both readers was significant (Kendall tau rank correlation coefficient, 0.373). The absolute reader agreement was 71.4%. The mean overall scan time was 12 min 44 s for the CMT protocol and 21 min 41 s for the multistep protocol. CONCLUSION Aorto-iliofemoral run-off CE-MRA acquired with CMT technique provides a high image quality equivalent to a multistep technique at an overall scan time reduction of 41.3%.
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Affiliation(s)
- Patrick Asbach
- University of Louisville Department of Radiology, Louisville, KY, USA
| | - Michael D Meade
- University of Louisville Department of Radiology, Louisville, KY, USA
| | | | - Christian Klessen
- Center for Diagnostic Radiology and Minimally Invasive Therapy, Berlin, Germany
| | | | - Jens O Heidenreich
- University of Louisville Department of Radiology, Louisville, KY, USA
- Dalhousie University, Department of Diagnostic Imaging, QE II Health Sciences Center Halifax Infirmary Site, Halifax, Nova Scotia, Canada
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Impact of Time-Resolved MRA on Diagnostic Accuracy in Patients With Symptomatic Peripheral Artery Disease of the Calf Station. AJR Am J Roentgenol 2013; 201:1368-75. [DOI: 10.2214/ajr.13.10584] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Morelli JN, Gerdes CM, Schmitt P, Ai T, Saettele MR, Runge VM, Attenberger UI. Technical considerations in MR angiography: An image-based guide. J Magn Reson Imaging 2013; 37:1326-41. [DOI: 10.1002/jmri.24174] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Accepted: 03/20/2013] [Indexed: 11/09/2022] Open
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Kramer JH, Arnoldi E, François CJ, Wentland AL, Nikolaou K, Wintersperger BJ, Grist TM. Dynamic and static magnetic resonance angiography of the supra-aortic vessels at 3.0 T: intraindividual comparison of gadobutrol, gadobenate dimeglumine, and gadoterate meglumine at equimolar dose. Invest Radiol 2013; 48:121-8. [PMID: 23211552 PMCID: PMC3818529 DOI: 10.1097/rli.0b013e31827752b4] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE The purpose of this study was the intraindividual comparison of a 1.0 M and two 0.5 M gadolinium-based contrast agents (GBCA) using equimolar dosing in dynamic and static magnetic resonance angiography (MRA) of the supra-aortic vessels. MATERIALS AND METHODS In this institutional review board-approved study, a total of 20 healthy volunteers (mean ± SD age, 29 ± 6 years) underwent 3 consecutive supra-aortic MRA examinations on a 3.0 T magnetic resonance system. The order of GBCA (Gadobutrol, Gadobenate dimeglumine, and Gadoterate meglumine) was randomized with a minimum interval of 48 hours between the examinations. Before each examination and 45 minutes after each examination, circulatory parameters were recorded. Total GBCA dose per MRA examination was 0.1 mmol/kg with a 0.03 mmol/kg and 0.07 mmol/kg split for dynamic and static MRA, respectively, injected at a rate of 2 mL/s. Two blinded readers qualitatively assessed static MRA data sets independently using pairwise rankings (superior, inferior, and equal). In addition, quantitative analysis was performed with signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) evaluation as well as vessel sharpness analysis of static MRA using an in-house-developed semiautomated tool. Dynamic MRA was evaluated for maximal SNR. Statistical analysis was performed using the Cohen κ, the Wilcoxon rank sum tests, and mixed effects models. RESULTS No significant differences of hemodynamic parameters were observed. In static MRA, Gadobutrol was rated superior to Gadoterate meglumine (P < 0.05) and equal to Gadobenate dimeglumine (P = 0.06) with good to excellent reader agreement (κ, 0.66-0.83). In static MRA, SNR was significantly higher using 1.0 M Gadobutrol as compared with either 0.5 M agent (P < 0.05 and P < 0.05) and CNR was significantly higher as compared with Gadoterate meglumine (P < 0.05), whereas CNR values of Gadobutrol data sets were not significantly different as compared with Gadobenate dimeglumine (P = 0.13). Differences in CNR between Gadobenate dimeglumine and Gadoterate meglumine were not significant (P = 0.78). Differences in vessel sharpness between the different GBCAs were also not significant (P > 0.05). Maximal SNR in dynamic MRA using Gadobutrol was significantly higher than both comparators at the level of the proximal and distal internal carotid artery (P < 0.05 and P < 0.05; P < 0.05 and P < 0.05). CONCLUSIONS At equimolar doses, 1.0 M Gadobutrol demonstrates higher SNR/CNR than do Gadobenate dimeglumine and Gadoterate meglumine, with superior image quality as compared with Gadoterate meglumine for dynamic and static carotid MRA. Despite the shortened bolus with Gadobutrol, no blurring of vessel edges was observed.
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Affiliation(s)
- Jens Harald Kramer
- Institute for Clinical Radiology, Ludwig Maximilians University Hospital Munich, Munich, Germany.
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Riffel P, Haneder S, Attenberger UI, Brade J, Schoenberg SO, Michaely HJ. Combined large field-of-view MRA and time-resolved MRA of the lower extremities: Impact of acquisition order on image quality. Eur J Radiol 2012; 81:2754-8. [DOI: 10.1016/j.ejrad.2011.12.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2011] [Accepted: 12/01/2011] [Indexed: 11/25/2022]
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Nielsen YW, Thomsen HS. Contrast-enhanced peripheral MRA: technique and contrast agents. Acta Radiol 2012; 53:769-77. [PMID: 22843836 DOI: 10.1258/ar.2012.120008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In the last decade contrast-enhanced magnetic resonance angiography (CE-MRA) has gained wide acceptance as a valuable tool in the diagnostic work-up of patients with peripheral arterial disease. This review presents current concepts in peripheral CE-MRA with emphasis on MRI technique and contrast agents. Peripheral CE-MRA is defined as an MR angiogram of the arteries from the aortic bifurcation to the feet. Advantages of CE-MRA include minimal invasiveness and lack of ionizing radiation. The basic technique employed for peripheral CE-MRA is the bolus-chase method. With this method a paramagnetic MRI contrast agent is injected intravenously and T1-weighted images are acquired in the subsequent arterial first-pass phase. In order to achieve high quality MR angiograms without interfering venous contamination or artifacts, a number of factors need to be taken into account. This includes magnetic field strength of the MRI system, receiver coil configuration, use of parallel imaging, contrast bolus timing technique, and k-space filling strategies. Furthermore, it is possible to optimize peripheral CE-MRA using venous compression techniques, hybrid scan protocols, time-resolved imaging, and steady-state MRA. Gadolinium(Gd)-based contrast agents are used for CE-MRA of the peripheral arteries. Extracellular Gd agents have a pharmacokinetic profile similar to iodinated contrast media. Accordingly, these agents are employed for first-pass MRA. Blood-pool Gd-based agents are characterized by prolonged intravascular stay, due to macromolecular structure or protein binding. These agents can be used for first-pass, as well as steady-state MRA. Some Gd-based contrast agents with low thermodynamic stability have been linked to development of nephrogenic systemic fibrosis in patients with severe renal insufficiency. Using optimized technique and a stable MRI contrast agent, peripheral CE-MRA is a safe procedure with diagnostic accuracy close to that of conventional catheter X-ray angiography.
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Affiliation(s)
- Yousef W Nielsen
- Deparment of Radiology, Copenhagen University Hospital Bispebjerg, Bispebjerg
| | - Henrik S Thomsen
- Department of Diagnostic Radiology, Copenhagen University Hospital Herlev, Denmark
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Haneder S, Attenberger UI, Schoenberg SO, Loewe C, Arnaiz J, Michaely HJ. Comparison of 0.5M gadoterate and 1.0M gadobutrol in peripheral MRA: A prospective, single-center, randomized, crossover, double-blind study. J Magn Reson Imaging 2012; 36:1213-21. [DOI: 10.1002/jmri.23760] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Accepted: 06/19/2012] [Indexed: 11/07/2022] Open
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Koziel K, Attenberger UI, Lederle K, Haneder S, Schoenberg SO, Michaely HJ. Peripheral MRA with continuous table movement: Imaging speed and robustness compared to a conventional stepping table technique. Eur J Radiol 2011; 80:537-42. [DOI: 10.1016/j.ejrad.2011.01.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Accepted: 01/04/2011] [Indexed: 11/16/2022]
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Moriya S, Miki Y, Yokobayashi T, Yamamoto A, Kanagaki M, Komori Y, Fujimoto K, Ishikawa M. Optimization of the number of selectable channels for spine phased array coils for transverse imaging. Jpn J Radiol 2011; 29:166-70. [PMID: 21519989 DOI: 10.1007/s11604-010-0532-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Accepted: 10/11/2010] [Indexed: 11/30/2022]
Abstract
PURPOSE The aim of this study was to investigate whether the signal-to-noise ratio (SNR) in transverse images acquired from spine phased array coils is improved by deactivating coils distant from the imaging region and to identify the optimum coil settings. MATERIALS AND METHODS Ten healthy volunteers (five men, five women; average age 38 years) underwent transverse magnetic resonance imaging (MRI) of the cervical spine using four to one channels of a four-channel phased array coil for cervical imaging. The SNR of cerebrospinal fluid (CSF), spinal cord, muscle tissue, intervertebral disc, vertebral body, and prevertebral soft tissue was measured for each coil combination. RESULTS In all measured regions, the SNR was the highest for images acquired using two coils; the SNR was significantly higher for two coils than for four coils in CSF, spinal cord, muscle tissue, intervertebral disc, vertebral body, and prevertebral soft tissue (P < 0.001, P = 0.019, P < 0.0001, P = 0.014, P = 0.010, P < 0.001). CONCLUSION Deactivating two of the four coils used for sagittal sections, meaning that two coils are active, resulted in improved SNR for transverse images. Selecting the optimum number and combination of coils for each imaging cross section may enable acquisition of images with a better SNR.
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Affiliation(s)
- Susumu Moriya
- Ishikawa Clinic, 46-1 Shimokamo-Umenoki-cho, Sakyo-ku, Kyoto 606-0851, Japan.
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Kramer H, Runge VM, Morelli JN, Williams KD, Naul LG, Nikolaou K, Reiser MF, Wintersperger BJ. Magnetic resonance angiography of the carotid arteries: comparison of unenhanced and contrast enhanced techniques. Eur Radiol 2011; 21:1667-76. [DOI: 10.1007/s00330-011-2110-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 02/02/2011] [Accepted: 02/09/2011] [Indexed: 10/18/2022]
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Haneder S, Attenberger UI, Riffel P, Henzler T, Schoenberg SO, Michaely HJ. Magnetic resonance angiography (MRA) of the calf station at 3.0 T: intraindividual comparison of non-enhanced ECG-gated flow-dependent MRA, continuous table movement MRA and time-resolved MRA. Eur Radiol 2011; 21:1452-61. [DOI: 10.1007/s00330-011-2063-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 12/04/2010] [Accepted: 12/13/2010] [Indexed: 12/01/2022]
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Attenberger UI, Haneder S, Morelli JN, Diehl SJ, Schoenberg SO, Michaely HJ. Peripheral Arterial Occlusive Disease: Evaluation of a High Spatial and Temporal Resolution 3-T MR Protocol with a Low Total Dose of Gadolinium versus Conventional Angiography. Radiology 2010; 257:879-87. [DOI: 10.1148/radiol.10100781] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Voth M, Attenberger UI, Luckscheiter A, Haneder S, Henzler T, Schoenberg SO, Schwenke C, Michaely HJ. "Number needed to read"--how to facilitate clinical trials in MR-angiography. Eur Radiol 2010; 21:1034-42. [PMID: 20972569 PMCID: PMC3072474 DOI: 10.1007/s00330-010-1993-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2010] [Revised: 08/30/2010] [Accepted: 09/29/2010] [Indexed: 11/28/2022]
Abstract
Purpose To evaluate the effect of the number of readers on the statistical results in peripheral MRA. Materials and methods 40 patients with peripheral arterial occlusive disease were included as a sample dataset in this study, randomly separated into two matched groups with n = 20 patients (group 1—gadobutrol, group 2—gadoterate meglumine) who underwent a continuous table movement MRA of the peripheral vessels at 3 T. Image quality (IQ) of 17 vessel segments was evaluated by 5 independent readers. The effect of the number of readers on significance and statistical power was statistically analyzed. Results Image quality in group 1 (gadobutrol) ranks significantly higher compared to group 2 (gadoterade meglumine) with a diagnostic IQ in 97% vs. 78% (p < 0.0001). For the diagnostic/non-diagnostic IQ assessment significance was reached with one reader 1/5 times (20%), with two readers in 4/10 (40%), with three readers in 6/10 (60%), with four readers in 4/5 (80%), with five readers in 1/1 (100%). Power considerations showed considerable gain when increasing the number of readers. Conclusion Increasing the number of readers in a diagnostic MRA-study can be used to achieve a higher power or to decrease the number of subjects included with maintained statistical validity.
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Affiliation(s)
- M Voth
- Institute of Clinical Radiology and Nuclear Medicine, University Medical Center Mannheim, Medical Faculty Mannheim, University of Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
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Weckbach S, Michaely HJ, Stemmer A, Schoenberg SO, Dinter DJ. Comparison of a new whole-body continuous-table-movement protocol versus a standard whole-body MR protocol for the assessment of multiple myeloma. Eur Radiol 2010; 20:2907-16. [PMID: 20574630 DOI: 10.1007/s00330-010-1865-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Revised: 05/11/2010] [Accepted: 05/19/2010] [Indexed: 12/22/2022]
Abstract
OBJECTIVES To evaluate a whole body (WB) continuous-table-movement (CTM) MR protocol for the assessment of multiple myeloma (MM) in comparison to a step-by-step WB protocol. METHODS Eighteen patients with MM were examined at 1.5T using a WB CTM protocol (axial T2-w fs BLADE, T1-w GRE sequence) and a step-by-step WB protocol including coronal/sagittal T1-w SE and STIR sequences as reference. Protocol time was assessed. Image quality, artefacts, liver/spleen assessability, and the ability to depict bone marrow lesions less than or greater than 1 cm as well as diffuse infiltration and soft tissue lesions were rated. Potential changes in the Durie and Salmon Plus stage and the detectability of complications were assessed. RESULTS Mean protocol time was 6:38 min (CTM) compared to 24:32 min (standard). Image quality was comparable. Artefacts were more prominent using the CTM protocol (P = 0.0039). Organ assessability was better using the CTM protocol (P < 0.001). Depiction of bone marrow and soft tissue lesions was identical without a staging shift. Vertebral fractures were not detected using the CTM protocol. CONCLUSIONS The new protocol allows a higher patient throughput and facilitates the depiction of extramedullary lesions. However, as long as vertebral fractures are not detectable, the protocol cannot be safely used for clinical routine without the acquisition of an additional sagittal sequence.
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Affiliation(s)
- S Weckbach
- Department of Clinical Radiology, University Hospital Munich-Grosshadern Campus, Marchioninistr. 15, 81377, Munich, Germany.
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Meaney JFM, Fagan AJ, Beddy P. Magnetic resonance angiography of abdominal vessels at 3 T. Top Magn Reson Imaging 2010; 21:189-197. [PMID: 21847038 DOI: 10.1097/rmr.0b013e318228ca49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Magnetic resonance angiography (MRA) has evolved significantly since first described in the early 1990s. Unrivaled image quality and freedom from artifacts has made it a reliable and widely utilized technique. Imaging at 3 T offers the potential for higher resolutions images with better temporal resolution compared to 1.5 T. This article will review the technique and contrast agents required to perform MRA at 3 T and the relevant clinical applications. We also discuss non-contrast enhanced MRA in the era of nephrogenic systemic fibrosis and future prospect for MRA at 3 T.
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Affiliation(s)
- James F M Meaney
- Centre for Advanced Magnetic Resonance Imaging, St. James's Hospital, Dublin, Ireland.
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Peripheral Magnetic Resonance Angiography With Continuous Table Movement in Combination With High Spatial and Temporal Resolution Time-Resolved MRA With a Total Single Dose (0.1 mmol/kg) of Gadobutrol at 3.0 T. Invest Radiol 2009; 44:627-33. [DOI: 10.1097/rli.0b013e3181b4c26c] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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RODITI G, KUSUMAWIDJAJA D. Magnetic resonance angiography and computed tomography angiography for peripheral arterial disease. IMAGING 2009. [DOI: 10.1259/imaging/55671114] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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The Value of Dual-Energy Bone Removal in Maximum Intensity Projections of Lower Extremity Computed Tomography Angiography. Invest Radiol 2009; 44:285-92. [DOI: 10.1097/rli.0b013e31819b70ba] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kramer H, Nikolaou K, Sommer W, Reiser MF, Herrmann KA. Peripheral MR Angiography. Magn Reson Imaging Clin N Am 2009; 17:91-100. [DOI: 10.1016/j.mric.2008.12.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Current advances in magnetic resonance, as a diagnostic modality, are discussed in the context of publications from Investigative Radiology during 2007 and 2008. The articles relating to this topic, published during the past 2 years, are reviewed by anatomic region. The discussion concludes with a consideration of magnetic resonance contrast media, focusing on studies published in the journal, and examining in particular the potential impact of nephrogenic systemic fibrosis.
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Feasibility of Gadofosveset-Enhanced Steady-State Magnetic Resonance Angiography of the Peripheral Vessels at 3 Tesla With Dixon Fat Saturation. Invest Radiol 2008; 43:635-41. [DOI: 10.1097/rli.0b013e31817ee53a] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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