WE-G-217A-08: Routine ACR SNR Measurement Failed to Detect 32-Channel Head Coil Receiver Malfunction

Medical Physics
Q Peng

Abstract

To study if malfunction of a receiver can be detected robustly using the simple ACR SNR measurement approach on a 32-channel head coil. Standard ACR T1W images (11slice) were acquired with a commercial 32 channel head coil on a 3T Philips Achieva MR scanner following the ACR recommended setup. Raw data were saved and were used to reconstruct 32 image datasets, each with one coil channel turned off and signal were excluded from reconstruction. Routine simple SNR evaluation method was used to measure SNR for each dataset. Specifically, region of interest (ROI) analysis was performed on slice #7 for each dataset. Signal was the mean value of the pixel intensity measured using an ROI with area of 200 cm(2) positioned at the center of phantom. Noise was the standard deviation derived from an ROI positioned in the background in a corner of the image. SNR was then calculated from signal divided by noise. For comparison purposes, we empirically chose 5% SNR drop compared to the full 32 channel dataset SNR as a significant SNR drop that is correlated a potential coil channel defect. Among the 32 image datasets reconstructed each with one receiver turned off, only 4 showed SNR drop of more than 5% or more compared to the reference SNR ob...Continue Reading

Related Concepts

Related Feeds

Cajal Bodies & Gems

Cajal bodies or coiled bodies are dense foci of coilin protein. Gemini of Cajal bodies, or gems, are microscopically similar to Cajal bodies. It is believed that Cajal bodies play important roles in RNA processing while gems assist the Cajal bodies. Find the latest research on Cajal bodies and gems here.

Related Papers

Nihon Hoshasen Gijutsu Gakkai zasshi
Hiroshi ImaiJSRT Research Group for standardization of SNR measurement in parallel MRI
Nihon Hoshasen Gijutsu Gakkai zasshi
Yasuo TakatsuTosiaki Miyati
© 2022 Meta ULC. All rights reserved