Diffusion-Weighted Imaging of the Prostate

Barth, Borna K.; Cornelius, Alexander; Nanz, Daniel; Eberli, Daniel; Donati, Olivio F.

doi:10.1097/rli.0000000000000184

Cited by 37 publications

(13 citation statements)

References 29 publications

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“…This difference was especially pronounced for susceptibility artifacts, most likely due to remaining air in the ER coil balloon causing inhomogeneities of the static magnetic field [30] and possibly the ER conducting wire loop itself. Moreover, incorrect placement and rotation of the ER coil itself may deform and/or displace the prostate and additionally lead to susceptibility artifacts in the posterior aspect of the gland [28,31]. These artifacts together with the higher SNR achieved in DWI sequences with the PPA coil-which was most likely the result of the higher number of averages chosen for this sequence-may have rendered the advantage of a higher resolution achieved by the ER coil void and most likely lead to the fact that on a side-by-side comparison both readers preferred PPA coil over ER coil image sets in more than half of the cases.…”

Section: Discussionmentioning

confidence: 98%

“…Functional imaging techniques, such as DWI, have become an integral part of mpMRI of the prostate [3,28] and comparative studies regarding the image quality of DWI between PPA coil and ER coil acquisition in the same patient remain sparse. A recent study has demonstrated a benefit of the use of an ER coil in detecting prostate cancer as compared to use of a PPA coil [17].…”

Section: Discussionmentioning

confidence: 99%

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Comparison of image quality and patient discomfort in prostate MRI: pelvic phased array coil vs. endorectal coil

et al. 2016

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Comparison of image quality and patient discomfort in prostate MRI: pelvic phased array coil vs. endorectal coil

et al. 2016

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“…However, for functional MR sequences (e.g. diffusion weighted imaging) the magnitude of distortion is much higher and requires dedicated study to investigate its optimal use in radiotherapy planning context [16] , [17] .…”

Section: Discussionmentioning

confidence: 99%

Prospective analysis of in vivo landmark point-based MRI geometric distortion in head and neck cancer patients scanned in immobilized radiation treatment position: Results of a prospective quality assurance protocol

Mohamed¹,

Hansen²,

Weygand³

et al. 2017

Clinical and Translational Radiation Oncology

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PurposeUncertainties related to geometric distortion are a major obstacle for effectively utilizing MRI in radiation oncology. We aim to quantify the geometric distortion in patient images by comparing their in-treatment position MRIs with the corresponding planning CTs, using CT as the non-distorted gold standard.MethodsTwenty-one head and neck cancer patients were imaged with MRI as part of a prospective Institutional Review Board approved study. MR images were acquired with a T2 SE sequence (0.5 × 0.5 × 2.5 mm voxel size) in the same immobilization position as in the CTs. MRI to CT rigid registration was then done and geometric distortion comparison was assessed by measuring the corresponding anatomical landmarks on both the MRI and the CT images. Several landmark measurements were obtained including; skin to skin (STS), bone to bone, and soft tissue to soft tissue at specific levels in horizontal and vertical planes of both scans. Inter-observer variability was assessed and interclass correlation (ICC) was calculated.ResultsA total of 430 landmark measurements were obtained. The median distortion for all landmarks in all scans was 1.06 mm (IQR 0.6–1.98). For each patient 48% of the measurements were done in the right-left direction and 52% were done in the anteroposterior direction. The measured geometric distortion was not statistically different in the right-left direction compared to the anteroposterior direction (1.5 ± 1.6 vs. 1.6 ± 1.7 mm, respectively, p = 0.4). The magnitude of distortion was higher in the STS peripheral landmarks compared to the more central landmarks (2.0 ± 1.9 vs. 1.2 ± 1.3 mm, p < 0.0001). The mean distortion measured by observer one was not significantly different compared to observer 2, 3, and 4 (1.05, 1.23, 1.06 and 1.05 mm, respectively, p = 0.4) with ICC = 0.84.ConclusionMRI geometric distortions were quantified in radiotherapy planning applications with a clinically insignificant error of less than 2 mm compared to the gold standard CT.

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“…15 Due to briefer echo-trains and shorter echo-spacing, in comparison to conventional ss-DTI sequences, rs-DTI is capable of achieving a higher image resolution, an increased signal-to-noise-ratio (SNR) and a reduction of susceptibility-based artifacts. New rs-DTI has been applied previously in pelvic imaging, 18 prostate imaging, 19 cerebral imaging, 20,21 and lumbar nerve root imaging. 22 A direct comparison of ss-DTI and rs-DTI techniques for DTI of the brachial plexus is desirable before implementation in clinical routine and has not been performed yet.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Tensor Imaging of the Brachial Plexus: A Comparison between Readout-segmented and Conventional Single-shot Echo-planar Imaging

Ciritsis

Manoliu

et al. 2019

MRMS

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Purpose: Diffusion tensor imaging (DTI) adds functional information to morphological magnetic resonance neurography (MRN) in the assessment of the brachial nerve plexus. To determine the most appropriate pulse sequence in scan times suited for diagnostic imaging in clinical routine, we compared image quality between simultaneous multi-slice readout-segmented (rs-DTI) and conventional single-shot (ss-DTI) echo-planar imaging techniques. Methods: Institutional Review Board (IRB) approved study including 10 healthy volunteers. The supraclavicular brachial plexus, covering the nerve roots and trunks from C5 to C7, was imaged on both sides with rs-DTI and ss-DTI. Both sequences were acquired in scan times <7 min with b -values of 900 s/mm 2 and with isotropic spatial resolution. Results: In rs-DTI image, the overall quality was significantly better and distortion artifacts were significantly lower ( P = 0.001–0.002 and P = 0.001–0.002, respectively) for both readers. In ss-DTI, a trend toward lower degree of ghosting and motion artifacts was elicited (reader 1, P = 0.121; reader 2, P = 0.264). No significant differences between the two DTI techniques were found for signal-to-noise ratios (SNR), contrast-to-noise ratios (CNR) and fractional anisotropy (FA) ( P ≥ 0.475, P ≥ 0.624, and P ≥ 0.169, respectively). Interreader agreement for all examined parameters and all sequences ranged from intraclass correlation coefficient (ICC) 0.064 to 0.905 and Kappa 0.40 to 0.851. Conclusion: Incomparable acquisition times rs-DTI showed higher image quality and less distortion artifacts than ss-DTI. The trend toward a higher degree of ghosting and motion artifacts in rs-DTI did not deteriorate image quality to a significant degree. Thus, rs-DTI should be considered for functional MRN of the brachial plexus.

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Diffusion-Weighted Imaging of the Prostate

Abstract: Selective-excitation accelerated reduced-FOV DW images (sTX-DWI) of the prostate can be acquired more than 5 times faster than rs-DWI with comparable image quality, at the expense of significantly increased geometric distortion.

Cited by 37 publications

References 29 publications

Comparison of image quality and patient discomfort in prostate MRI: pelvic phased array coil vs. endorectal coil

Comparison of image quality and patient discomfort in prostate MRI: pelvic phased array coil vs. endorectal coil

Prospective analysis of in vivo landmark point-based MRI geometric distortion in head and neck cancer patients scanned in immobilized radiation treatment position: Results of a prospective quality assurance protocol

Diffusion Tensor Imaging of the Brachial Plexus: A Comparison between Readout-segmented and Conventional Single-shot Echo-planar Imaging

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