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Keywords:
Thorax, Computer applications, Radioprotection / Radiation dose, CT, Comparative studies, Computer Applications-Detection, diagnosis, Technology assessment, Image registration, Image verification
Authors:
M. Ohana1, A. Labani1, M.-Y. Jeung1, C. Ludes1, C. Roy1, C. Collet2, F. Heitz2, F. Rousseau2, V. Noblet2; 1Strasbourg/FR, 2Illkirch/FR
DOI:
10.1594/ecr2016/C-2126
Results
Population
CT examinations of 15 men and 10 women were analyzed.
Mean age of patients was 64.7±11.6 years old (range 35-91).
Mean BMI was 26.2 ±4.3 kg/m² (range 17-33).
Radiation Dose
Mean Dose Length Product of the ULD acquisition was 15.6±1.9mGy.cm (Effective Dose: 0.22mSv) versus 219±108mGy.cm (ED: 3mSv) for the full dose acquisition.
Quantitative evaluation
A PSNR increase was demonstrated for all denoised ULD images,
with a maximum obtained at a β coefficient of 4.4±2.8,
i.e. for β2 or β5 denoised sets.
The mean PSNR increase was +8.5% when compared to the original non denoised ULD acquisition.
Qualitative evaluation
Only denoised images with β≤2 were ranked before (i.e. were of higher quality) the original ULD acquisitions,
with the β1,
β1.5 and β2 denoised sets ranked higher.
In details,
β1 denoised sets were ranked first in 34%,
β1.5 in 24% and β2 in 17%.
Examples
ULD CT of a 63yo woman with a BMI of 29 (DLP: 16.2mGy.cm)
Fig. 3: Original non-denoised ULD-CT image
Fig. 4: Optimal denoised ULD-CT image (β1.5, PSNR=6)
Fig. 5: Insufficiently denoised ULD-CT image (β0.5, PSNR=4.2)
Fig. 6: Overly denoised ULD-CT image (β10, PSNR=5.1)
ULD CT of a 56yo man with a BMI of 24 (DLP: 15.8mGy.cm)
Fig. 7: Example 2