Readout-segmented echo-planar imaging for diffusion-weighted imaging in the pelvis at 3T—a feasibility study

Rationale and Objectives: Diffusion-weighted imaging (DWI) of the pelvis at 3T is prone to artifacts that diminish the image quality. Readout-segmented echo-planar imaging (RS-EPI) is a new DWI technique that can reduce the artifacts associated with standard single-shot echo-planar imaging (SS-EPI) DWI. The purpose of this study was to evaluate the feasibility and image quality of RS-EPI in pelvic DWI compared to SS-EPI on a 3T imaging system. Materials and Methods: Thirty patients underwent pelvic DWI on a 3T scanner with SS-EPI and RS-EPI techniques. Two blinded readers independently assessed each set of images for geometric distortion, image blurring, ghosting artifacts, lesion conspicuity, and overall image quality on a 7-point scale. Qualitative image scores were compared using paired Wilcoxon signed rank test. Interreader correlation was assessed by Spearman rank correlation. Results: Geometric distortion, imaging blurring, ghosting artifacts, lesion conspicuity, and overall image quality were rated significantly better by both readers for RS-EPI technique (P < .01 for all parameters). There was moderate–high correlation between the readers (r = 0.649–0.752) for all parameters apart from lesion conspicuity (r = 0.351). Both readers preferred the RS-EPI set of DWI images in most of the cases (reader 1: 0.87, 95% CI 0.74–0.99; reader 2: 0.77, 95% CI 0.61–0.93). Mean difference and limits of agreement between apparent diffusion coefficient (ADC) values obtained from the two methods were 0.01 (−0.08, 0.10) × 10−3 mm2/s. Conclusions: RS-EPI DWI images showed improved image quality compared to SS-EPI technique at 3T. RS-EPI is a feasible technique in the pelvis for producing high-resolution DWI

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Infiltrative pattern of metastatic invasive lobular breast carcinoma in the abdomen: a pictorial review

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Comparison of metrics for the evaluation of medical segmentations using prostate MRI dataset

10.1016/j.compbiomed.2021.104497Computers in Biology and Medicine13410449

Classification of CT Findings in 200 patients with unexplained weight loss.

<p>Classification of CT Findings in 200 patients with unexplained weight loss.</p

Association between positive CT scan findings and baseline patient variables using univariate logistic regression.

<p>Association between positive CT scan findings and baseline patient variables using univariate logistic regression.</p

Baseline characteristics of patients (n = 200).

<p>Baseline characteristics of patients (n = 200).</p

True positive category 1 scan—findings highly suspicious for organic etiology.

<p>(A) Axial CT scan of an 80 year old male demonstrates bowel wall thickening of the sigmoid colon (arrow) suspicious for underlying malignancy. (B) Multiple hypodense hepatic lesions are consistent with metastases (arrowheads).</p