MR imaging of healthy knees in varying degrees of flexion using a stretchable coil array provides comparable image quality compared to a standard knee coil array

2016 ◽  
Vol 85 (3) ◽  
pp. 518-523 ◽  
Author(s):  
Jurek A. Nordmeyer-Massner ◽  
Klaas P. Pruessmann ◽  
Michael Wyss ◽  
Andrei Manoliu ◽  
Jürg Hodler ◽  
...  
Keyword(s):  
Image Quality ◽  
Mr Imaging ◽  
Coil Array ◽  
Knee Coil ◽  
Comparable Image Quality

scholarly journals Intraoperative 3T MR Imaging for Spinal Cord Tumor Resection: Feasibility, Timing, and Image Quality Using a “Twin” MR–Operating Room Suite

2008 ◽  
Vol 29 (10) ◽  
pp. 1991-1994 ◽  
Author(s):  
T.P. Duprez ◽  
A. Jankovski ◽  
C. Grandin ◽  
L. Hermoye ◽  
G. Cosnard ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Image Quality ◽  
Mr Imaging ◽  
Operating Room ◽  
Spinal Cord Tumor ◽  
Tumor Resection ◽  
3T Mr

scholarly journals A Location Map Reduced Reversible Data Hiding Method Using Prediction Error Modification

2012 ◽  
Vol 6-7 ◽  
pp. 428-433
Author(s):  
Yan Wei Li ◽  
Mei Chen Wu ◽  
Tung Shou Chen ◽  
Wien Hong
Keyword(s):  
Image Quality ◽  
Data Hiding ◽  
Prediction Error ◽  
Reversible Data Hiding ◽  
Experimental Results ◽  
Cover Image ◽  
Prediction Errors ◽  
Secret Data ◽  
Location Map ◽  
Comparable Image Quality

We propose a reversible data hiding technique to improve Hong and Chen’s (2010) method. Hong and Chen divide the cover image into pixel group, and use reference pixels to predict other pixel values. Data are then embedded by modifying the prediction errors. However, when solving the overflow and underflow problems, they employ a location map to record the position of saturated pixels, and these pixels will not be used to carry data. In their method, if the image has a plenty of saturated pixels, the payload is decreased significantly because a lot of saturated pixels will not joint the embedment. We improve Hong and Chen’s method such that the saturated pixels can be used to carry data. The positions of these saturated pixels are then recorded in a location map, and the location map is embedded together with the secret data. The experimental results illustrate that the proposed method has better payload, will providing a comparable image quality.

MR imaging with remote reception using a coil array

2012 ◽  
Author(s):  
F. Vazquez ◽  
O. Marrufo ◽  
R. Martin ◽  
A. O. Rodriguez
Keyword(s):  
Mr Imaging ◽  
Coil Array

scholarly journals Coronary computed tomography angiography (CCTA): effect of bolus-tracking ROI positioning on image quality

2020 ◽  
Author(s):  
Heiner Nebelung ◽  
Thomas Brauer ◽  
Danilo Seppelt ◽  
Ralf-Thorsten Hoffmann ◽  
Ivan Platzek
Keyword(s):  
Image Quality ◽  
Left Atrium ◽  
Coronary Arteries ◽  
Coronary Computed Tomography Angiography ◽  
Pulmonary Arteries ◽  
Ascending Aorta ◽  
Triple Rule Out ◽  
Comparable Image Quality ◽  
Rule Out

Abstract Objectives The aim of the study was to evaluate the effect of bolus-tracking ROI positioning on coronary computed tomography angiography (CCTA) image quality. Methods In this retrospective monocentric study, all patients had undergone CCTA by step-and-shoot mode to rule out coronary artery disease within a cohort at intermediate risk. Two groups were formed, depending on ROI positioning (left atrium (LA) or ascending aorta (AA)). Each group contained 96 patients. To select pairs of patients, propensity score matching was used. Image quality with regard to coronary arteries as well as pulmonary arteries was evaluated using quantitative and qualitative scores. Results In terms of the coronary arteries, there was no significant difference between both groups using quantitative (SNR AA 14.92 vs. 15.46; p = 0.619 | SNR LM 19.80 vs. 20.30; p = 0.661 | SNR RCA 24.34 vs. 24.30; p = 0.767) or qualitative scores (4.25 vs. 4.29; p = 0.672), respectively. With regard to pulmonary arteries, we found significantly higher quantitative (SNR RPA 8.70 vs. 5.89; p < 0.001 | SNR LPA 9.06 vs. 6.25; p < 0.001) and qualitative scores (3.97 vs. 2.24; p < 0.001) for ROI positioning in the LA than for ROI positioning in the AA. Conclusions ROI positioning in the LA or the AA results in comparable image quality of CT coronary arteriography, while positioning in the LA leads to significantly higher image quality of the pulmonary arteries. These results support ROI positioning in the LA, which also facilitates triple-rule-out CT scanning. Key Points • ROI positioning in the left atrium or the ascending aorta leads to comparable image quality of the coronary arteries. • ROI positioning in the left atrium results in significantly higher image quality of the pulmonary arteries. • ROI positioning in the left atrium is feasible to perform triple-rule-out CTA.

scholarly journals Hybrid Monopole/Loop Coil Array for Human Head MR Imaging at 7 T

2015 ◽  
Vol 46 (5) ◽  
pp. 541-550 ◽  
Author(s):  
Xinqiang Yan ◽  
Long Wei ◽  
Rong Xue ◽  
Xiaoliang Zhang
Keyword(s):  
Mr Imaging ◽  
Human Head ◽  
Coil Array ◽  
Loop Coil

scholarly journals Design of a Four-Channel Surface Receiver Coil Array Without Preamplifiers for the Decoupling Between Elements: Validation for High-Resolution Rat Knee MR Imaging

2013 ◽  
Vol 13 (6) ◽  
pp. 2450-2458 ◽  
Author(s):  
Anne-Laure Perrier ◽  
Jean-Christophe Goebel ◽  
Astrid Pinzano-Watrin ◽  
Emilie Roeder ◽  
Pierre Gillet ◽  
...  
Keyword(s):  
High Resolution ◽  
Mr Imaging ◽  
Receiver Coil ◽  
Coil Array ◽  
Channel Surface

scholarly journals In vitro and in vivo comparison of wrist MR imaging at 3.0 and 7.0 tesla using a gradient echo sequence and identical eight-channel coil array designs

2011 ◽  
Vol 33 (3) ◽  
pp. 661-667 ◽  
Author(s):  
Jurek A. Nordmeyer-Massner ◽  
Michael Wyss ◽  
Gustav Andreisek ◽  
Klaas P. Pruessmann ◽  
Juerg Hodler
Keyword(s):  
Mr Imaging ◽  
Gradient Echo ◽  
Coil Array ◽  
Channel Coil
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