scholarly journals The effect of reconstruction and acquisition parameters for GRAPPA-based parallel imaging on the image quality

2011 ◽  
Vol 66 (2) ◽  
pp. 402-409 ◽  
Author(s):  
S. Bauer ◽  
M. Markl ◽  
M. Honal ◽  
B. A. Jung
Keyword(s):  
Image Quality ◽  
Parallel Imaging

scholarly journals Feasibility of Total Variation Noise Reduction Algorithm According to Various MR-Based PET Images in a Simultaneous PET/MR System: A Phantom Study

Diagnostics ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 319
Author(s):  
Chan-Rok Park ◽  
Seong-Hyeon Kang ◽  
Young-Jin Lee
Keyword(s):  
Image Quality ◽  
Noise Reduction ◽  
Total Variation ◽  
Parallel Imaging ◽  
Pulse Sequence ◽  
Reduction Algorithm ◽  
Median Filters ◽  
Reduction Techniques ◽  
Imaging Results ◽  
Noise Reduction Algorithm

Recently, the total variation (TV) algorithm has been used for noise reduction distribution in degraded nuclear medicine images. To acquire positron emission tomography (PET) to correct the attenuation region in the PET/magnetic resonance (MR) system, the MR Dixon pulse sequence, which is based on controlled aliasing in parallel imaging, results from higher acceleration (CAIPI; MR-ACDixon-CAIPI) and generalized autocalibrating partially parallel acquisition (GRAPPA; MR-ACDixon-GRAPPA) algorithms are used. Therefore, this study aimed to evaluate the image performance of the TV noise reduction algorithm for PET/MR images using the Jaszczak phantom by injecting 18F radioisotopes with PET/MR, which is called mMR (Siemens, Germany), compared with conventional noise-reduction techniques such as Wiener and median filters. The contrast-to-noise (CNR) and coefficient of variation (COV) were used for quantitative analysis. Based on the results, PET images with the TV algorithm were improved by approximately 7.6% for CNR and decreased by approximately 20.0% for COV compared with conventional noise-reduction techniques. In particular, the image quality for the MR-ACDixon-CAIPI PET image was better than that of the MR-ACDixon-GRAPPA PET image. In conclusion, the TV noise-reduction algorithm is efficient for improving the PET image quality in PET/MR systems.

scholarly journals Parallel Imaging of the Cervical Spine at 3T: Optimized Trade-Off between Speed and Image Quality

2012 ◽  
Vol 33 (10) ◽  
pp. 1867-1874 ◽  
Author(s):  
J. Fruehwald-Pallamar ◽  
P. Szomolanyi ◽  
N. Fakhrai ◽  
A. Lunzer ◽  
M. Weber ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Image Quality ◽  
Parallel Imaging ◽  
Trade Off

scholarly journals Cardiac CINE MR imaging with a 32-channel cardiac coil and parallel imaging: Impact of acceleration factors on image quality and volumetric accuracy

2006 ◽  
Vol 23 (2) ◽  
pp. 222-227 ◽  
Author(s):  
Bernd J. Wintersperger ◽  
Scott B. Reeder ◽  
Konstantin Nikolaou ◽  
Olaf Dietrich ◽  
Armin Huber ◽  
...  
Keyword(s):  
Image Quality ◽  
Mr Imaging ◽  
Parallel Imaging ◽  
Cardiac Coil ◽  
Cine Mr ◽  
Cardiac Cine ◽  
Channel Cardiac Coil ◽  
Volumetric Accuracy

High-resolution renal MRA: Comparison of image quality and vessel depiction with different parallel imaging acceleration factors

2006 ◽  
Vol 24 (1) ◽  
pp. 95-100 ◽  
Author(s):  
Henrik J. Michaely ◽  
Karin A. Herrmann ◽  
Harald Kramer ◽  
Olaf Dietrich ◽  
Gerhard Laub ◽  
...  
Keyword(s):  
High Resolution ◽  
Image Quality ◽  
Parallel Imaging ◽  
Renal Mra ◽  
Parallel Imaging Acceleration

scholarly journals Echo Planar Diffusion-Weighted Imaging: Possibilities and Considerations with 12- and 32-Channel Head Coils

2012 ◽  
Vol 2 ◽  
pp. 31 ◽  
Author(s):  
John N Morelli ◽  
Megan R Saettele ◽  
Rajesh A Rangaswamy ◽  
Lan Vu ◽  
Clint M Gerdes ◽  
...  
Keyword(s):  
Image Quality ◽  
Parallel Imaging ◽  
Brain Magnetic Resonance Imaging ◽  
Single Shot ◽  
Quality Improvements ◽  
Planar Imaging ◽  
Diffusion Weighted ◽  
Resolution Imaging ◽  
Echo Planar ◽  
Parallel Imaging Acceleration

Interest in clinical brain magnetic resonance imaging using 32-channel head coils for signal reception continues to increase. The present investigation assesses possibilities for improving diffusion-weighted image quality using a 32-channel in comparison to a conventional 12-channel coil. The utility of single-shot (ss) and an approach to readout-segmented (rs) echo planar imaging (EPI) are examined using both head coils. Substantial image quality improvements are found with rs-EPI. Imaging with a 32-channel head coil allows for implementation of greater parallel imaging acceleration factors or acquisition of scans at a higher resolution. Specifically, higher resolution imaging with rs-EPI can be achieved by increasing the number of readout segments without increasing echo-spacing or echo time to the degree necessary with ss-EPI — a factor resulting in increased susceptibility artifact and reduced signal-to-noise with the latter.

scholarly journals New Imaging Strategies Using a Motion-Resistant Liver Sequence in Uncooperative Patients

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Bong Soo Kim ◽  
Kyung Ryeol Lee ◽  
Myeng Ju Goh
Keyword(s):  
Image Quality ◽  
Parallel Imaging ◽  
Spin Echo ◽  
Improve Patient Care ◽  
Motion Artifact ◽  
Motion Artifacts ◽  
Single Shot ◽  
Minimization Method ◽  
Rapid Acquisition ◽  
Imaging Results

MR imaging has unique benefits for evaluating the liver because of its high-resolution capability and ability to permit detailed assessment of anatomic lesions. In uncooperative patients, motion artifacts can impair the image quality and lead to the loss of diagnostic information. In this setting, the recent advances in motion-resistant liver MR techniques, including faster imaging protocols (e.g., dual-echo magnetization-prepared rapid-acquisition gradient echo (MP-RAGE), view-sharing technique), the data under-sampling (e.g., gradient recalled echo (GRE) with controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA), single-shot echo-train spin-echo (SS-ETSE)), and motion-artifact minimization method (e.g., radial GRE with/without k-space-weighted image contrast (KWIC)), can provide consistent, artifact-free images with adequate image quality and can lead to promising diagnostic performance. Understanding of the different motion-resistant options allows radiologists to adopt the most appropriate technique for their clinical practice and thereby significantly improve patient care.

scholarly journals Image Quality Characteristics of the 3D-parallel Imaging Method (CAIPIRINHA) in Abdominal MRI

2016 ◽  
Vol 72 (11) ◽  
pp. 1161-1168
Author(s):  
Ryohei Hatakeyama ◽  
Takeshi Makabe ◽  
Manami Karino ◽  
Ayaka Sasaki ◽  
Arisa Takami ◽  
...  
Keyword(s):  
Image Quality ◽  
Parallel Imaging ◽  
Quality Characteristics ◽  
Imaging Method ◽  
Abdominal Mri ◽  
Parallel Imaging Method

scholarly journals Wave-controlled aliasing in parallel imaging magnetization-prepared gradient echo (wave-CAIPI MPRAGE) accelerates speed for pediatric brain MRI with comparable diagnostic performance

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Younghee Yim ◽  
Mi Sun Chung ◽  
Su Yeong Kim ◽  
Na Mi Lee ◽  
Jun Soo Byun ◽  
...  
Keyword(s):  
Basal Ganglia ◽  
Image Quality ◽  
Parallel Imaging ◽  
Reliable Method ◽  
Pediatric Patients ◽  
Motion Artifacts ◽  
Gradient Echo ◽  
Post Contrast ◽  
Scan Time ◽  
Intracranial Lesions

AbstractWe aimed to compare accelerated post-contrast magnetization-prepared rapid gradient-echo (MPRAGE) using wave-controlled aliasing in parallel imaging (wave-CAIPI) with conventional MPRAGE as a reliable method to diagnose intracranial lesions in pediatric patients. A total of 23 consecutive pediatric patients who underwent post-contrast wave-CAIPI and conventional MPRAGE (scan time: 2 min 39 s vs. 5 min 46 s) were retrospectively evaluated. Two radiologists independently assessed each image for the presence of intracranial lesions. Quantitative [contrast-to-noise ratio (CNR), contrast rate (CR), and signal-to-noise ratio (SNR)] and qualitative parameters (overall image quality, gray-white matter differentiation, demarcation of basal ganglia and sulci, and motion artifacts) were also surveyed. Wave-CAIPI MPRAGE and conventional MPRAGE detected enhancing and non-enhancing intracranial lesions with 100% agreement. Although wave-CAIPI MPRAGE had a lower SNR (all p < 0.05) and overall image quality (overall analysis, p = 0.02) compared to conventional MPRAGE, other quantitative (CNR and CR) and qualitative parameters (gray-white differentiation, demarcation of basal ganglia and sulci, and motion artifacts) were comparable in the pooled analysis and between both observers (all p > 0.05). Wave-CAIPI MPRAGE was a reliable method for diagnosing intracranial lesions in pediatric patients as conventional MPRAGE at half the scan time.

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