Vol 9: Zoomed EPI-DWI of the Pancreas Using Two-Dimensional Spatially-Selective Radiofrequency Excitation Pulses.Reportar como inadecuado



 Vol 9: Zoomed EPI-DWI of the Pancreas Using Two-Dimensional Spatially-Selective Radiofrequency Excitation Pulses.


Vol 9: Zoomed EPI-DWI of the Pancreas Using Two-Dimensional Spatially-Selective Radiofrequency Excitation Pulses. - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Descargar gratis o leer online en formato PDF el libro: Vol 9: Zoomed EPI-DWI of the Pancreas Using Two-Dimensional Spatially-Selective Radiofrequency Excitation Pulses.
This article is from PLoS ONE, volume 9.AbstractBackground: Implementation of DWI in the abdomen is challenging due to artifacts, particularly those arising from differences in tissue susceptibility. Two-dimensional, spatially-selective radiofrequency RF excitation pulses for single-shot echo-planar imaging EPI combined with a reduction in the FOV in the phase-encoding direction i.e. zooming leads to a decreased number of k-space acquisition lines, significantly shortening the EPI echo train and potentially susceptibility artifacts. Purpose: To assess the feasibility and image quality of a zoomed diffusion-weighted EPI z-EPI sequence in MR imaging of the pancreas. The approach is compared to conventional single-shot EPI c-EPI. Material and Methods: 23 patients who had undergone an MRI study of the abdomen were included in this retrospective study. Examinations were performed on a 3T whole-body MR system Magnetom Skyra, Siemens equipped with a two-channel fully dynamic parallel transmit array TimTX TrueShape, Siemens. The acquired sequences consisted of a conventional EPI DWI of the abdomen and a zoomed EPI DWI of the pancreas. For z-EPI, the standard sinc excitation was replaced with a two-dimensional spatially-selective RF pulse using an echo-planar transmit trajectory. Images were evaluated with regard to image blur, respiratory motion artifacts, diagnostic confidence, delineation of the pancreas, and overall scan preference. Additionally ADC values of the pancreatic head, body, and tail were calculated and compared between sequences. Results: The pancreas was better delineated in every case 23-23 with z-EPI versus c-EPI. In every case 23-23, both readers preferred z-EPI overall to c-EPI. With z-EPI there was statistically significantly less image blur p



Autor: Riffel, Philipp; Michaely, Henrik J.; Morelli, John N.; Pfeuffer, Josef; Attenberger, Ulrike I.; Schoenberg, Stefan O.; Haneder, Stefan

Fuente: https://archive.org/







Documentos relacionados