Shortened breath-hold contrast-enhanced MRI of the liver using a new parallel imaging technique, CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration): a comparison with conventional GRAPPA technique

Ogawa, Masaki; Kawai, Tatsuya; Kan, Hirohito; Kobayashi, Susumu; Akagawa, Yoshihiro; Suzuki, Kazushi; Nojiri, Shunsuke; Ozawa, Yuichi; Shibamoto, Yuta

doi:10.1007/s00261-015-0491-z

Cited by 16 publications

(7 citation statements)

References 18 publications

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“…Techniques such as parallel imaging, view sharing, and pseudorandom undersampling (compressed sensing), alone or in combination, enable the acquisition of 3D GRE sequences in less than 10 seconds. This allows maintenance of spatial resolution and coverage in a shorter breath‐hold, although the signal‐to‐noise ratio (SNR) may be reduced . Similarly, acquiring multiple arterial phases during a standard breath‐hold using fast T 1 sequences can improve the chances of obtaining at least one adequate arterial phase .…”

Section: Pitfalls Of Pre‐ and Postcontrast T1‐weighted Sequencesmentioning

confidence: 99%

“…This allows maintenance of spatial resolution and coverage in a shorter breath-hold, although the signal-to-noise ratio (SNR) may be reduced. 29,30 Similarly, acquiring multiple arterial phases during a standard breath-hold using fast T 1 sequences can improve the chances of obtaining at least one adequate arterial phase. 19 Caution, however, is advised when using view-sharing techniques without compensatory motion sorting, due to the possible propagation of the respiratory motion to all the acquisitions that share the same k-space data.…”

Section: Respiratory Motion-related Pitfallsmentioning

confidence: 99%

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Pitfalls in liver MRI: Technical approach to avoiding misdiagnosis and improving image quality

Yacoub

Elsayes

Fowler

et al. 2018

Magnetic Resonance Imaging

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The following is an illustrative review of common pitfalls in liver MRI that may challenge interpretation. This article reviews common technical and diagnostic challenges encountered when interpreting dynamic multiphasic T1‐weighted imaging, hepatobiliary phase imaging, and diffusion‐weighted imaging of the liver. Additionally, each section includes suggestions for avoiding diagnostic and technical errors. Level of Evidence: 5 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2019;49:41–58.

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Section: Pitfalls Of Pre‐ and Postcontrast T1‐weighted Sequencesmentioning

confidence: 99%

Section: Respiratory Motion-related Pitfallsmentioning

confidence: 99%

Pitfalls in liver MRI: Technical approach to avoiding misdiagnosis and improving image quality

Yacoub

Elsayes

Fowler

et al. 2018

Magnetic Resonance Imaging

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“…Radial k-space sampling leads to higher sampling density of the central k-space parts and to undersampling of k-space periphery, reducing the influence of motion-induced phase errors on image quality. On the other hand, new parallel imaging techniques allow highly accelerated acquisition, resulting in substantially shorter breath-hold intervals [9, 10]. …”

Section: Introductionmentioning

confidence: 99%

Rapid Cartesian versus radial acquisition: comparison of two sequences for hepatobiliary phase MRI at 3 tesla in patients with impaired breath-hold capabilities

et al. 2017

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BackgroundHepatocyte-specific gadolinium based contrast agents (HSCA) provide substantial information for the classification of liver lesions in magnetic resonance imaging (MRI). However, breathing artifacts which reduce image quality and diagnostic confidence of hepatobiliary phase acquisitions are regularly observed in clinical routine. The aim of this study was to evaluate two approaches to reduce breathing artifacts for hepatobiliary phase imaging.MethodsTwenty minutes after administration of a HSCA (gadoxetic acid), a T1-weighted VIBE sequence with radial k-space sampling (radialVIBE, 180 s acquisition time in free breathing) and a highly accelerated Cartesian VIBE with Dixon fat separation (CD-VIBE, CAIPIRINHA acceleration with r = 2 × 2, breath-hold 8–10 s) were acquired in 35 patients (12 female, 57 ± 13 years), who showed breath-holding difficulties in early phases of the examinations. Image quality (image sharpness, noise, artifacts, homogeneity of fat saturation, bile duct delineation and overall image quality) as well as conspicuity and liver-to-lesion signal intensity (SI) ratios of focal liver lesions were assessed for both radial- and CD-VIBE.ResultsOverall image quality was rated good to excellent for both sequences, while CD-VIBE was preferred in most cases. Though radialVIBE received better results regarding image noise and artifacts, both sequences were rated equally regarding bile duct delineation and sharpness. Focal liver lesion (n = 42) conspicuity was rated significantly better and SI-ratios were significantly higher on CD-VIBE (2.45 ± 1.44 vs. 1.61 ± 0.70 in radialVIBE, p = 0.0001). In three patients, CD-VIBE was rated non-diagnostic due to severe breathing artifacts, while radialVIBE was diagnostic in those patients.ConclusionBoth highly accelerated Cartesian as well as radial acquisition techniques provide good to excellent image quality in hepatobiliary phase MRI. In comparison, CD-VIBE offered better overall image quality and liver lesion conspicuity. However, radialVIBE was a valuable alternative in patients unable to sustain even short breath-hold intervals. Further studies including lager patient cohorts are desirable to allow a transfer of these results to a general patient population.

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“…: readers 1 and 2). TSE-DWI and EPI-DWI (b = 800 s/mm 2 ) images, both with ADC maps, were evaluated in separate viewing sessions at intervals of at least two weeks following previous visual evaluation studies, 11 referring to T 2 -weighted or other images. The degree of lesion conspicuity, image distortion, image noise, and overall image quality were visually graded with 4-point scales: score 1, unacceptable; score 2, poor; score 3, moderate; score 4, good.…”

Section: Image Data Analysismentioning

confidence: 99%

“…Signal-to-noise ratio calculations were carried out using the identical ROI method described previously. 11 The ROIs were manually selected within homogeneous and artifact-free areas in the muscle on DWI images. Similar ROIs were placed using the copy-and-paste method for each TSE-DWI and EPI-DWI.…”

Section: Image Data Analysismentioning

confidence: 99%

Evaluation of Thin-slice Coronal Single-shot Turbo Spin-echo Diffusion-weighted Imaging of the Hand: A Comparison with Conventional Echo-planar Diffusion-weighted Imaging

Ogawa

Nakagawa

Arai

et al. 2020

MRMS

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We prospectively evaluated thin-slice coronal turbo spin-echo (TSE) diffusion-weighted imaging (DWI) covering a larger area with the recently-developed techniques on a 3T MRI scanner, compared with echoplanar imaging (EPI)-DWI in patients undergoing routine hand MRI. Visual score assessment and apparent diffusion coefficient (ADC) measurement were performed for patients with suspected hand tumors. TSE-DWI was superior to EPI-DWI, with less image distortion. The visual score and ADC comparison assessments proved that the image noise of TSE-DWI was acceptable.breast and lung cancers, and spinal cord infarction. 1,5-10 To the best of our knowledge, however, there have been no TSE-DWI studies evaluating musculoskeletal lesions of the hand or foot. In addition, only one previous case report evaluated middle ear cholesteatoma using 2-mm-thick single-shot TSE-DWI, but ADC measurement was not performed and the acquisition time was not presented. 6 TSE-DWI using the recently-developed parallel imaging and single-shot technique on 3T MRI might yield a superior image quality and is already used clinically. However, the image quality of thin-slice TSE-DWI for the assessment of small musculoskeletal lesions has not yet been clarified. Thus, the purpose of this study was to prospectively examine whether the 2-mm-thick coronal TSE-DWI covering a larger area and small lesions could substitute for conventional EPI-DWI in patients undergoing routine hand MRI on a 3T scanner. Materials and Methods Study designThis prospective study was performed in accordance with the ethical standards of our Institutional Review Board. Written informed consent was obtained from the patients and their privacy was completely protected. Eligibility criteria for entry were: (1) adult patients suspected of having or being followed for a musculoskeletal tumor of the hand or finger, (2) patient agreement to cooperate, and (3) examination on a Philips 3T MRI scanner (Ingenia; Philips Medical Systems, Eindhoven, The Netherlands). The exclusion criteria were:(1) contraindications to MR (incompatible metal implants or pacemakers), and (2) motion artifacts and artifacts from unsuppressed fat on the images. The primary endpoint of the

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Shortened breath-hold contrast-enhanced MRI of the liver using a new parallel imaging technique, CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration): a comparison with conventional GRAPPA technique

Abstract: The shortened breath-hold 3D-VIBE sequence using the new CAIPIRINHA technique with a high AF of 4 was superior to the conventional GRAPPA sequence. The shortened breath-hold sequence using GRAPPA with a high AF of 4 worsened the image quality and lesion conspicuity.

Cited by 16 publications

References 18 publications

Pitfalls in liver MRI: Technical approach to avoiding misdiagnosis and improving image quality

Pitfalls in liver MRI: Technical approach to avoiding misdiagnosis and improving image quality

Rapid Cartesian versus radial acquisition: comparison of two sequences for hepatobiliary phase MRI at 3 tesla in patients with impaired breath-hold capabilities

Evaluation of Thin-slice Coronal Single-shot Turbo Spin-echo Diffusion-weighted Imaging of the Hand: A Comparison with Conventional Echo-planar Diffusion-weighted Imaging

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