Investigation of the relation between administered dose and image quality for pediatric 99mTc-DMSA renal scintigraphy: clinical study applying the JSNM (Japanese Society of Nuclear Medicine) pediatric dosage card

2018 ◽  
Vol 33 (3) ◽  
pp. 153-159 ◽  
Author(s):  
Takahiro Fujiwara ◽  
Kuniyuki Hidaka ◽  
Keiichi Sugibayashi ◽  
Makoto Matsumoto ◽  
Tetsuo Kida ◽  
...  
Keyword(s):  
Nuclear Medicine ◽  
Clinical Study ◽  
Image Quality ◽  
Japanese Society ◽  
Renal Scintigraphy

scholarly journals Clinical study in phase- contrast mammography: image-quality analysis

2014 ◽  
Vol 372 (2010) ◽  
pp. 20130025 ◽  
Author(s):  
Renata Longo ◽  
Maura Tonutti ◽  
Luigi Rigon ◽  
Fulvia Arfelli ◽  
Diego Dreossi ◽  
...  
Keyword(s):  
Clinical Study ◽  
Synchrotron Radiation ◽  
Image Quality ◽  
Digital Mammography ◽  
Phase Contrast ◽  
Medical Physics ◽  
University Hospital ◽  
Quality Analysis ◽  
Radiology Department ◽  
Contrast Imaging

The first clinical study of phase-contrast mammography (PCM) with synchrotron radiation was carried out at the Synchrotron Radiation for Medical Physics beamline of the Elettra synchrotron radiation facility in Trieste (Italy) in 2006–2009. The study involved 71 patients with unresolved breast abnormalities after conventional digital mammography and ultrasonography exams carried out at the Radiology Department of Trieste University Hospital. These cases were referred for mammography at the synchrotron radiation facility, with images acquired using a propagation-based phase-contrast imaging technique. To investigate the contribution of phase-contrast effects to the image quality, two experienced radiologists specialized in mammography assessed the visibility of breast abnormalities and of breast glandular structures. The images acquired at the hospital and at the synchrotron radiation facility were compared and graded according to a relative seven-grade visual scoring system. The statistical analysis highlighted that PCM with synchrotron radiation depicts normal structures and abnormal findings with higher image quality with respect to conventional digital mammography.

Evaluation of three-dimensional iterative image reconstruction in virtual monochromatic imaging at 40 kilo-electron volts: phantom and clinical studies to assess the image noise and image quality in comparison with other reconstruction techniques

2020 ◽  
Vol 93 (1110) ◽  
pp. 20190675
Author(s):  
Takuya Ishikawa ◽  
Shigeru Suzuki ◽  
Yoshiaki Katada ◽  
Tomoko Takayanagi ◽  
Rika Fukui ◽  
...  
Keyword(s):  
Clinical Study ◽  
Image Reconstruction ◽  
Image Quality ◽  
Three Dimensional ◽  
Image Noise ◽  
Reconstruction Technique ◽  
Iterative Image Reconstruction ◽  
Virtual Monochromatic Imaging ◽  
Monochromatic Imaging

Objective: The purpose of this study was to evaluate the image quality in virtual monochromatic imaging (VMI) at 40 kilo-electron volts (keV) with three-dimensional iterative image reconstruction (3D-IIR). Methods: A phantom study and clinical study (31 patients) were performed with dual-energy CT (DECT). VMI at 40 keV was obtained and the images were reconstructed using filtered back projection (FBP), 50% adaptive statistical iterative reconstruction (ASiR), and 3D-IIR. We conducted subjective and objective evaluations of the image quality with each reconstruction technique. Results: The image contrast-to-noise ratio and image noise in both the clinical and phantom studies were significantly better with 3D-IIR than with 50% ASiR, and with 50% ASiR than with FBP (all, p < 0.05). The standard deviation and noise power spectra of the reconstructed images decreased in the order of 3D-IIR to 50% ASiR to FBP, while the modulation transfer function was maintained across the three reconstruction techniques. In most subjective evaluations in the clinical study, the image quality was significantly better with 3D-IIR than with 50% ASiR, and with 50% ASiR than with FBP (all, p < 0.001). Regarding the diagnostic acceptability, all images using 3D-IIR were evaluated as being fully or probably acceptable. Conclusions: The quality of VMI at 40 keV is improved by 3D-IIR, which allows the image noise to be reduced and structural details to be maintained. Advances in knowledge: The improvement of the image quality of VMI at 40 keV by 3D-IIR may increase the subjective acceptance in the clinical setting.

Software development for ACR-approved phantom-based nuclear medicine tomographic image quality control with cross-platform compatibility

2015 ◽  
Vol 67 (2) ◽  
pp. 323-328
Author(s):  
Jungsu S. Oh ◽  
Jae Min Choi ◽  
Ki Pyo Nam ◽  
Sun Young Chae ◽  
Jin-Sook Ryu ◽  
...  
Keyword(s):  
Quality Control ◽  
Nuclear Medicine ◽  
Image Quality ◽  
Software Development ◽  
Tomographic Image ◽  
Image Quality Control ◽  
Cross Platform
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