scholarly journals Evaluation of image quality and recovery coefficient of corn starch-bonded Rhizophora spp. particleboards as phantom for SPECT/CT imaging

2019 ◽  
Vol 555 ◽  
pp. 012031
Author(s):  
P N K Abd Hamid ◽  
M F Mohd Yusof ◽  
A A Tajuddin ◽  
R Hashim ◽  
R Zainon
Keyword(s):  
Image Quality ◽  
Corn Starch ◽  
Ct Imaging ◽  
Recovery Coefficient

scholarly journals PET/CT NEMA Body Phantom Image Reconstruction Study Using 2 mm Voxel Size for Improved Image Quality

2021 ◽  
Author(s):  
Sebastijan Rep ◽  
Petra Tomše ◽  
Luka Jensterle ◽  
Katja Zaletel ◽  
Luka Ležaič
Keyword(s):  
Image Quality ◽  
Spatial Resolution ◽  
Standardized Uptake Value ◽  
Volume Effect ◽  
Ct Imaging ◽  
Recovery Coefficient ◽  
Voxel Size ◽  
Phantom Image ◽  
Pet Ct ◽  
Anatomic Information

Abstract Background PET/CT imaging is widely used in oncology and provides both metabolic and anatomic information. Because of the relatively poor spatial resolution of PET/CT imaging technique the detection of small lesions is limited. The low spatial resolution introduces the partial-volume effect (PVE) which negatively affects images both visually and quantitatively. The aim of our research was to investigate the effect of 4 mm and 2 mm voxel size on image quality and on detection of small spheres. MethodsWe used the NEMA body phantom with six fillable spheres. The spheres and background were filled with a solution of 18F-FDG, in ratio spheres vs background 2:1, 3:1, 4:1 and 8:1 In all images reconstructed with 2 mm and 4 mm voxel size the contrast recovery coefficient (CRC), contrast to noise ratio (CNR) in standardized uptake value (SUV) were evaluated.ResultsFor phantom spheres ≤ 13 mm, we found significant higher CRC, SUV and CNR using small-voxel reconstructions. CRC and SUV did not differ for large spheres (≥ 17 mm) using 2 mm and 4 mm voxel size. On the other hand, CNR for large spheres (≥ 17 mm) was significantly decreased in 2 mm voxel size images compared to the 4 mm.ConclusionAccording to our results, the reconstruction with 2 mm voxel size can improve precise lesion localization, image contrast, and image quality.

Ultralow Dose CT Imaging for Navigated Skull Base Surgery Using ASIR and MBIR-2D and 3D Image Quality

2014 ◽  
Vol 75 (S 02) ◽  
Author(s):  
Gerlig Widmann ◽  
P. Schullian ◽  
R. Hoermann ◽  
E. Gassner ◽  
H. Riechelmann ◽  
...  
Keyword(s):  
Image Quality ◽  
Skull Base ◽  
Skull Base Surgery ◽  
Ct Imaging ◽  
3D Image ◽  
Ultralow Dose ◽  
2D And 3D

Cold wall effect eliminating method to determine the contrast recovery coefficient for small animal PET scanners using the NEMA NU-4 image quality phantom

2014 ◽  
Vol 59 (11) ◽  
pp. 2727-2746 ◽  
Author(s):  
Imre Lajtos ◽  
Johannes Czernin ◽  
Magnus Dahlbom ◽  
Freddie Daver ◽  
Miklos Emri ◽  
...  
Keyword(s):  
Image Quality ◽  
Small Animal ◽  
Wall Effect ◽  
Small Animal Pet ◽  
Cold Wall ◽  
Recovery Coefficient ◽  
Animal Pet ◽  
Pet Scanners

scholarly journals Design and evaluation of corn starch-bonded Rhizophora spp. particleboard phantoms for SPECT/CT imaging

2018 ◽  
Vol 298 ◽  
pp. 012041 ◽  
Author(s):  
Puteri Nor Khatijah Abd Hamid ◽  
Mohd Fahmi Mohd Yusof ◽  
Abd Aziz Tajuddin ◽  
Rokiah Hashim ◽  
Rafidah Zainon
Keyword(s):  
Corn Starch ◽  
Ct Imaging

scholarly journals Evaluation of Radiation Dose and Image Quality using High-Pitch 70-kV Chest CT in Immunosuppressed Patients

2018 ◽  
Vol 191 (02) ◽  
pp. 122-129 ◽  
Author(s):  
Ibrahim Yel ◽  
Simon Martin ◽  
Julian Wichmann ◽  
Lukas Lenga ◽  
Moritz Albrecht ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Image Data ◽  
Ct Imaging ◽  
Chest Ct ◽  
Control Group ◽  
High Pitch ◽  
Dose Length Product ◽  
Subjective Image Quality ◽  
Immunosuppressed Patients

Purpose The aim of the study was to evaluate high-pitch 70-kV CT examinations of the thorax in immunosuppressed patients regarding radiation dose and image quality in comparison with 120-kV acquisition. Materials and Methods The image data from 40 patients (14 women and 26 men; mean age: 40.9 ± 15.4 years) who received high-pitch 70-kV CT chest examinations were retrospectively included in this study. A control group (n = 40), matched by age, gender, BMI, and clinical inclusion criteria, had undergone standard 120-kV chest CT imaging. All CT scans were performed on a third-generation dual-source CT unit. For an evaluation of the radiation dose, the CT dose index (CTDIvol), dose-length product (DLP), effective dose (ED), and size-specific dose estimates (SSDE) were analyzed in each group. The objective image quality was evaluated using signal-to-noise (SNR) and contrast-to-noise ratios (CNR). Three blinded and independent radiologists evaluated subjective image quality and diagnostic confidence using 5-point Likert scales. Results The mean dose parameters were significantly lower for high-pitch 70-kV CT examinations (CTDIvol, 2.9 ± 0.9 mGy; DLP, 99.9 ± 31.0 mGyxcm; ED, 1.5 ± 0.6 mSv; SSDE, 3.8 ± 1.2 mGy) compared to standard 120-kV CT imaging (CTDIvol, 8.8 ± 3.7mGy; DLP, 296.6 ± 119.3 mGyxcm; ED, 4.4 ± 2.1 mSv; SSDE, 11.6 ± 4.4 mGy) (P≤ 0.001). The objective image parameters (SNR: 7.8 ± 2.1 vs. 8.4 ± 1.8; CNR: 7.7 ± 2.4 vs. 8.3 ± 2.8) (P≥ 0.065) and the cumulative subjective image quality (4.5 ± 0.4 vs. 4.7 ± 0.3) (p = 0.052) showed no significant differences between the two protocols. Conclusion High-pitch 70-kV thoracic CT examinations in immunosuppressed patients resulted in a significantly reduced radiation exposure compared to standard 120-kV CT acquisition without a decrease in image quality. Key Points:  Citation Format

SU-FF-I-30: Image Quality and Dose Trends in Tube-Current Modulated Multi-Detector CT Imaging

2007 ◽  
Vol 34 (6Part3) ◽  
pp. 2344-2344
Author(s):  
R Fisher ◽  
D Hintenlang ◽  
M Arreola
Keyword(s):  
Image Quality ◽  
Ct Imaging ◽  
Tube Current

scholarly journals Micro-CT yields high image quality in human fetal post-mortem imaging despite maceration

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Ian Craig Simcock ◽  
Susan Cheng Shelmerdine ◽  
Dean Langan ◽  
Guy Anna ◽  
Neil James Sebire ◽  
...  
Keyword(s):  
Image Quality ◽  
Pregnancy Loss ◽  
Ct Imaging ◽  
Quality Score ◽  
Image Quality Score ◽  
Invasive Technique ◽  
Tissue Preparation ◽  
Post Mortem ◽  
Micro Ct ◽  
High Image Quality

Abstract Background Current clinical post-mortem imaging techniques do not provide sufficiently high-resolution imaging for smaller fetuses after pregnancy loss. Post-mortem micro-CT is a non-invasive technique that can deliver high diagnostic accuracy for these smaller fetuses. The purpose of the study is to identify the main predictors of image quality for human fetal post-mortem micro-CT imaging. Methods Human fetuses were imaged using micro-CT following potassium tri-iodide tissue preparation, and axial head and chest views were assessed for image quality on a Likert scale by two blinded radiologists. Simple and multivariable linear regression models were performed with demographic details, iodination, tissue maceration score and imaging parameters as predictor variables. Results 258 fetuses were assessed, with median weight 41.7 g (2.6–350 g) and mean gestational age 16 weeks (11–24 weeks). A high image quality score (> 6.5) was achieved in 95% of micro-CT studies, higher for the head (median = 9) than chest (median = 8.5) imaging. The strongest negative predictors of image quality were increasing maceration and body weight (p < 0.001), with number of projections being the best positive imaging predictor. Conclusions High micro-CT image quality score is achievable following early pregnancy loss despite fetal maceration, particularly in smaller fetuses where conventional autopsy may be particularly challenging. These findings will help establish clinical micro-CT imaging services, addressing the need for less invasive fetal autopsy methods.

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