When Should Abdominal Magnetic Resonance Imaging Be Used?

Neto, José Aloizio Gonçalves; Elazzazzi, Mohamed; Altun, Ersan; Semelka, Richard C.

doi:10.1016/j.cgh.2008.03.013

Cited by 12 publications

(6 citation statements)

References 40 publications

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“…However, because investigators in studies have validated that highly compressed images remain diagnostically useful (such as with abdominal CT scans), this fi nding provides evidence that medical images are compressible (ie, they have far less information in them than we attempt to collect). Moreover, the results of work suggest that rather than collecting extensive image data only to discard it in the compression process, diagnostic images can be reconstructed from markedly undersampled data, thereby M agnetic resonance (MR) imaging offers superb soft-tissue characterization with global anatomic assessment, has no ionizing radiation ( 1 ), and, thus, has the potential to be a dominant pediatric imaging modality. However, a major limitation of MR imaging is slow imaging speed relative to computed tomography (CT).…”

Section: Discussionmentioning

confidence: 99%

Improved Pediatric MR Imaging with Compressed Sensing

Vasanawala¹,

Alley²,

Hargreaves³

et al. 2010

Radiology

231

203

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Purpose:To develop a method that combines parallel imaging and compressed sensing to enable faster and/or higher spatial resolution magnetic resonance (MR) imaging and show its feasibility in a pediatric clinical setting. Materials and Methods:Institutional review board approval was obtained for this HIPAA-compliant study, and informed consent or assent was given by subjects. A pseudorandom k-space undersampling pattern was incorporated into a threedimensional (3D) gradient-echo sequence; aliasing then has an incoherent noiselike pattern rather than the usual coherent fold-over wrapping pattern. This k-space-sampling pattern was combined with a compressed sensing nonlinear reconstruction method that exploits the assumption of sparsity of medical images to permit reconstruction from undersampled k-space data and remove the noiselike aliasing. Thirty-four patients (15 female and 19 male patients; mean age, 8.1 years; range, 0-17 years) referred for cardiovascular, abdominal, and knee MR imaging were scanned with this 3D gradient-echo sequence at high acceleration factors. Obtained k-space data were reconstructed with both a traditional parallel imaging algorithm and the nonlinear method. Both sets of images were rated for image quality, radiologist preference, and delineation of specifi c structures by two radiologists. Wilcoxon and symmetry tests were performed to test the hypothesis that there was no signifi cant difference in ratings for image quality, preference, and delineation of specifi c structures. Results:Compressed sensing images were preferred more often, had signifi cantly higher image quality ratings, and greater delineation of anatomic structures ( P , .001) than did images obtained with the traditional parallel reconstruction method. Conclusion:A combination of parallel imaging and compressed sensing is feasible in a clinical setting and may provide higher resolution and/or faster imaging, addressing the challenge of delineating anatomic structures in pediatric MR imaging.q RSNA, 2010

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Section: Discussionmentioning

confidence: 99%

Improved Pediatric MR Imaging with Compressed Sensing

Vasanawala¹,

Alley²,

Hargreaves³

et al. 2010

Radiology

231

203

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“…The authors propose a diagnostic algorithm for evaluating small-bowel CD in which "CTE and ileocolonoscopy are fi rst-line combined tests." MRI was not evaluated in this study, but another recent American recommendation for abdominal imaging states that body MRI should be used in "the majority of abdomen and pelvic serial studies for chronic infl ammatory disease" because of the lack of ionizing radiation [59].…”

Section: Narrow Band Imagingmentioning

confidence: 97%

Advances in epidemiology and diagnosis of inflammatory bowel diseases

Ali

Tamboli

2008

Curr Gastroenterol Rep

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The etiology of chronic inflammatory bowel diseases (IBD) remains unknown. Understanding IBD epidemiology helps to identify at-risk individuals, to appreciate the changing demographic profile of IBD, and to interpret theories of IBD pathogenesis. This article reviews recent advances in epidemiology and diagnostics. The importance of Clostridium difficile is highlighted. State-of-the-art IBD diagnostic modalities include serology, fecal markers, and advanced radiologic or endoscopic techniques. These include wireless capsule endoscopy, balloon enteroscopy, chromoendoscopy, high-magnification endoscopy, and MRI. The increasing number of available modalities requires appreciation of their indications, strengths, and limitations. This article discusses these issues relevant to the clinician.

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“…Finally, MRI has relevant advantages over CT in terms of soft tissue contrast in the abdomen. [7][8][9]…”

Section: Ia Dynamic Mri (Dmri)mentioning

confidence: 99%

Respiration‐based sorting of dynamic MRI to derive representative 4D‐MRI for radiotherapy planning

et al. 2013

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They have presented a novel methodology employing dMRI to derive representative 4D-MRI. This set of techniques are practical in that (1) they employ MRI sequences that are standard across commercial vendors; (2) the 2D imaging planes can be oriented onto an arbitrary axis (e.g., sagittal, coronal, axial[ellipsis (horizontal)]); (3) the image processing techniques are relatively simple. Systematically applying this and similar dMRI-based techniques in patients is a crucial next step to demonstrate efficacy beyond CT-only based practice.

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When Should Abdominal Magnetic Resonance Imaging Be Used?

Cited by 12 publications

References 40 publications

Improved Pediatric MR Imaging with Compressed Sensing

Improved Pediatric MR Imaging with Compressed Sensing

Advances in epidemiology and diagnosis of inflammatory bowel diseases

Respiration‐based sorting of dynamic MRI to derive representative 4D‐MRI for radiotherapy planning

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