Contrast behavior and image quality of magnetic resonance cholangiopancreatography imaging using variable echo times at 3.0 T

2008 ◽  
Vol 32 (5) ◽  
pp. 362-366 ◽  
Author(s):  
Hiroyoshi Isoda ◽  
Yoji Maetani ◽  
Masako Kataoka ◽  
Shigeki Arizono ◽  
Kotaro Shimada ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Image Quality ◽  
Magnetic Resonance Cholangiopancreatography ◽  
3.0 T

Magnetic resonance cholangiopancreatography: image quality, ductal morphology, and value of additional T2‐ and T1‐weighted sequences for the assessment of suspected pancreatic cancer

2005 ◽  
Vol 46 (2) ◽  
pp. 117-125 ◽  
Author(s):  
E. Lopez Hänninen ◽  
J. Ricke ◽  
H. Amthauer ◽  
R. Röttgen ◽  
M. Böhmig ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Image Quality ◽  
Contrast Material ◽  
Magnetic Resonance Cholangiopancreatography ◽  
Pancreatic Tumors ◽  
Single Shot ◽  
Pancreatic Lesion ◽  
Thick Slab ◽  
Weighted Sequences

Purpose: To assess image quality and duct morphology on magnetic resonance cholangiopancreatography (MRCP) and also the value of additional T2‐ and T1‐weighted sequences for differentiation of benignity and malignancy in patients with suspected pancreatic tumors. Material and Methods: One‐hundred‐and‐fourteen patients received MRCP and unenhanced and contrast material‐enhanced MR imaging. MR results were analyzed independently by two blinded readers, and subsequently correlated with the results from surgery, biopsy, and follow‐up. Assessment included the evaluation of image quality, duct visualization and morphology, and the differentiation of pancreatic lesion status (benign versus malignant). Results: Overall, 49 patients had benign final diagnoses, while 65 had a malignant diagnosis. Image quality of single‐shot thick‐slab MRCP was rated significantly better than the MIP images of multisection MRCP. With MRCP alone, the two readers' accuracy in the assessment of pancreatic lesion status was 72% (95% CI, 64% to 83%) and 69% (95% CI, 56% to 77%), respectively; with the addition of T2‐ and T1‐weighted images the accuracy significantly improved to 89% (95% CI, 82% to 95%) and 84% (95% CI, 77% to 92%) for readers 1 and 2, respectively. Conclusion: Single‐shot thick‐slab MRCP and multisection MRCP provide complementary results; however, single‐shot MRCP had superior image quality. Moreover, assessment of ductal morphology with MRCP alone facilitated the diagnosis of different pathologic conditions of the pancreatobiliary system in the majority of patients. However, with the addition of T2‐ and T1‐weighted sequences the overall diagnostic accuracy was significantly improved and thus we consider that a comprehensive MR approach should comprise both MRCP techniques and parenchymal sequences.

Impact of butylscopolamine on image quality of magnetic resonance cholangiopancreatography

2013 ◽  
Vol 82 (4) ◽  
pp. 583-588 ◽  
Author(s):  
Nanda Venkatanarasimha ◽  
Sarah J. Jenkins ◽  
Natalie Yang ◽  
Errol Colak ◽  
Anish Kirpalani
Keyword(s):  
Magnetic Resonance ◽  
Image Quality ◽  
Magnetic Resonance Cholangiopancreatography

Camera-based respiratory triggering improves the image quality of 3D magnetic resonance cholangiopancreatography

2019 ◽  
Vol 120 ◽  
pp. 108675
Author(s):  
Felix Harder ◽  
Fabian K. Lohöfer ◽  
Georgios A. Kaissis ◽  
Christoph Zoellner ◽  
Omar Kamal ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Image Quality ◽  
Magnetic Resonance Cholangiopancreatography ◽  
Respiratory Triggering

scholarly journals Radial self-navigated native magnetic resonance angiography in comparison to navigator-gated contrast-enhanced MRA of the entire thoracic aorta in an aortic patient collective

2021 ◽  
Vol 23 (1) ◽  
Author(s):  
Martina Correa Londono ◽  
Nino Trussardi ◽  
Verena C. Obmann ◽  
Davide Piccini ◽  
Michael Ith ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Image Quality ◽  
Magnetic Resonance Angiography ◽  
Thoracic Aorta ◽  
Aortic Root ◽  
Aortic Disease ◽  
Ascending Aorta ◽  
Scan Time ◽  
Contrast Enhanced

Abstract Background The native balanced steady state with free precession (bSSFP) magnetic resonance angiography (MRA) technique has been shown to provide high diagnostic image quality for thoracic aortic disease. This study compares a 3D radial respiratory self-navigated native MRA (native-SN-MRA) based on a bSSFP sequence with conventional Cartesian, 3D, contrast-enhanced MRA (CE-MRA) with navigator-gated respiration control for image quality of the entire thoracic aorta. Methods Thirty-one aortic native-SN-MRA were compared retrospectively (63.9 ± 10.3 years) to 61 CE-MRA (63.1 ± 11.7 years) serving as a reference standard. Image quality was evaluated at the aortic root/ascending aorta, aortic arch and descending aorta. Scan time was recorded. In 10 patients with both MRA sequences, aortic pathologies were evaluated and normal and pathologic aortic diameters were measured. The influence of artifacts on image quality was analyzed. Results Compared to the overall image quality of CE-MRA, the overall image quality of native-SN-MRA was superior for all segments analyzed (aortic root/ascending, p < 0.001; arch, p < 0.001, and descending, p = 0.005). Regarding artifacts, the image quality of native-SN-MRA remained superior at the aortic root/ascending aorta and aortic arch before and after correction for confounders of surgical material (i.e., susceptibility-related artifacts) (p = 0.008 both) suggesting a benefit in terms of motion artifacts. Native-SN-MRA showed a trend towards superior intraindividual image quality, but without statistical significance. Intraindividually, the sensitivity and specificity for the detection of aortic disease were 100% for native-SN-MRA. Aortic diameters did not show a significant difference (p = 0.899). The scan time of the native-SN-MRA was significantly reduced, with a mean of 05:56 ± 01:32 min vs. 08:51 ± 02:57 min in the CE-MRA (p < 0.001). Conclusions Superior image quality of the entire thoracic aorta, also regarding artifacts, can be achieved with native-SN-MRA, especially in motion prone segments, in addition to a shorter acquisition time.

scholarly journals Applying Deep Learning to Accelerated Clinical Brain Magnetic Resonance Imaging for Multiple Sclerosis

2021 ◽  
Vol 12 ◽  
Author(s):  
Ashika Mani ◽  
Tales Santini ◽  
Radhika Puppala ◽  
Megan Dahl ◽  
Shruthi Venkatesh ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Deep Learning ◽  
Magnetic Resonance ◽  
Image Quality ◽  
Repeated Measures ◽  
Financial Burden ◽  
Brain Magnetic Resonance Imaging ◽  
Lesion Volume ◽  
Patient Reported

Background: Magnetic resonance (MR) scans are routine clinical procedures for monitoring people with multiple sclerosis (PwMS). Patient discomfort, timely scheduling, and financial burden motivate the need to accelerate MR scan time. We examined the clinical application of a deep learning (DL) model in restoring the image quality of accelerated routine clinical brain MR scans for PwMS.Methods: We acquired fast 3D T1w BRAVO and fast 3D T2w FLAIR MRI sequences (half the phase encodes and half the number of slices) in parallel to conventional parameters. Using a subset of the scans, we trained a DL model to generate images from fast scans with quality similar to the conventional scans and then applied the model to the remaining scans. We calculated clinically relevant T1w volumetrics (normalized whole brain, thalamic, gray matter, and white matter volume) for all scans and T2 lesion volume in a sub-analysis. We performed paired t-tests comparing conventional, fast, and fast with DL for these volumetrics, and fit repeated measures mixed-effects models to test for differences in correlations between volumetrics and clinically relevant patient-reported outcomes (PRO).Results: We found statistically significant but small differences between conventional and fast scans with DL for all T1w volumetrics. There was no difference in the extent to which the key T1w volumetrics correlated with clinically relevant PROs of MS symptom burden and neurological disability.Conclusion: A deep learning model that improves the image quality of the accelerated routine clinical brain MR scans has the potential to inform clinically relevant outcomes in MS.

scholarly journals Pancreatic Mass or Cyst? Diagnostic Dilemma

2019 ◽  
Vol 37 (6) ◽  
pp. 521-524
Author(s):  
Jagpal Singh Klair ◽  
Rahman Nakshabendi ◽  
Maheen Rajput ◽  
Henning Gerke ◽  
Rami El-Abiad
Keyword(s):  
Magnetic Resonance ◽  
Magnetic Resonance Cholangiopancreatography ◽  
Pancreatic Mass ◽  
Management Options ◽  
Diagnostic Dilemma ◽  
Recurrent Acute Pancreatitis ◽  
Single Episode ◽  
Minor Papilla ◽  
Diagnostic Modalities

A santorinicele is a rare anomaly defined as focal cystic dilation of the terminal portion of the dorsal pancreatic duct at the minor papilla. Importantly this anomaly has been suggested as a possible cause of relative stenosis of the minor papilla. This anomaly has been associated with pancreatic divisum and recurrent acute pancreatitis. Magnetic resonance imaging/magnetic resonance cholangiopancreatography and endoscopic ultrasound (EUS) are the main diagnostic modalities. Endoscopic minor papilla sphincterotomy has been shown to improve pain and quality of life in patients with this anomaly presenting with recurrent pancreatitis. We present a case of a single episode of pancreatitis who underwent EUS for evaluation of possible pancreatic mass leading to a diagnosis of santorinicele and complete pancreatic divisum. We attempt to describe this anomaly, diagnostic approach, and management options.

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