New OPTN/UNOS classification system for nodules in cirrhotic livers detected with MR imaging: effect on hepatocellular carcinoma detection and transplantation allocation.

Purpose: To assess the effect of the new Organ Procurement and Transplantation Network (OPTN)/United Network for Organ Sharing (UNOS) policy on hepatocellular carcinoma (HCC) detection and liver transplant allocation in patients with cirrhosis undergoing dynamic contrast material-enhanced liver magnetic resonance (MR) imaging.

Materials And Methods: In this HIPAA-compliant institutional review board-approved retrospective study with waiver of informed consent, 247 patients (196 men, 51 women; mean age, 60 years ± 11 [standard deviation]) with liver cirrhosis who underwent evaluation for HCC with MR imaging were identified via database search. Three radiologists independently reviewed images and identified number and size of HCC based on criteria within either the prior or revised policy.

Comparison of MRI pulse sequences for prediction of size of hepatocellular carcinoma at explant evaluation.

Objective: The purpose of this study was to retrospectively compare the size of hepatocellular carcinoma (HCC) on images obtained using different MRI pulse sequences with the tumor size determined at pathologic evaluation of liver explant specimens.

Materials And Methods: Ninety-two patients with HCC who underwent contrast-enhanced liver MRI within 90 days before liver transplant were included. A single pathologist measured the dominant HCC in each case.

Zoomed echo-planar imaging using parallel transmission: impact on image quality of diffusion-weighted imaging of the prostate at 3T.

Purpose: To assess impact of two-channel parallel transmission (pTx) with focused excitation [zoomed echo-planar imaging (EPI)] on image quality of prostate diffusion-weighted imaging (DWI) at 3T.

Methods: 27 male volunteers (27 ± 8 years) underwent 3T prostate MRI using 2-channel radiofrequency-transmit system and 18-channel torso receive coil. Scans included EPI-DWI sequence (b values 50, 500, 1000 s/mm(2)) acquired both with standard sinc pulse and 2-channel pTX with focused excitation, each acquired at large-field-of-view (FOV) (20 × 20 cm) and small-FOV (14 × 14 cm).

Whole-lesion apparent diffusion coefficient metrics as a marker of percentage Gleason 4 component within Gleason 7 prostate cancer at radical prostatectomy.

Purpose: To retrospectively assess the utility of whole-lesion apparent diffusion coefficient (ADC) metrics in characterizing the Gleason 4 component of Gleason 7 prostate cancer (PCa) at radical prostatectomy.

Materials And Methods: Seventy patients underwent phased-array coil 3T-magnetic resonance imaging (MRI) before prostatectomy. A uropathologist mapped locations and Gleason 4 percentage (G4%) of Gleason 7 tumors.

Complex cystic renal masses: comparison of cyst complexity and Bosniak classification between 1.5 T and 3 T MRI.

Purpose: To retrospectively compare perceived complexity and Bosniak cyst classification of cystic renal lesions between 1.5 T and 3 T MRI.

Methods: 33 cystic renal lesions in 26 patients that underwent contrast-enhanced MRI at both 1.