Dr. P back for MRI Online talking about the changes in PI-RADS 2.1. Perhaps the word changes doesn't necessarily apply properly here because we're talking about changes, revisions, and clarifications in this overview slide. Let's begin with image data acquisition, there have been some technical specifications and clarifications.
T2 weighted imaging is recommended in the axial plane. That axial plane can be acquired orthogonally or obliquely as we'll see in a moment. One additional plane should be acquired, that can be coronal or sagittal. In our practice we acquire both, the sagittal and the coronal in addition to the axial. Diffusion weighted imaging. We have clarified the B values to use for purposes of diffusion weighted imaging acquisition and for ADC map calculation. We'll define those in a separate vignette.
DCE or dynamic contrast enhanced MRI, some of you may be familiar with this in the breast or in the brain. It's more critical in the breast but temporal resolution for each step in the time activity curve continuum should be no more than a 15 second timeframe or less than 15 seconds. What do we use? We use in our practice something between seven and 12, depending upon the sophistication and speed of the instrument.
It is preferred that this dynamic acquisition be performed volumetrically with 3D T1 appearing gradient echo imaging. Then we have some clarifications and interpretation criteria. There have been further descriptions in assessment of lesions in the central area of the prostate or CZ area, and TZ area, and the anterior fibromuscular stroma. We're going to talk about these revisions in the upcoming vignette. Let's pause here, take a breather, and then we'll come back with revisions.
Browse other topics in...
Content reviewed: December 29, 2021