Effect of reconstruction methods and x‐ray tube current–time product on nodule detection in an anthropomorphic thorax phantom: A crossed‐modality JAFROC observer study
| العنوان: | Effect of reconstruction methods and x‐ray tube current–time product on nodule detection in an anthropomorphic thorax phantom: A crossed‐modality JAFROC observer study |
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| المؤلفون: | John D. Thompson, AK Tootell, Katy Szczepura, Peter Hogg, I. Vamvakas, David J. Manning, Dev P. Chakraborty |
| المصدر: | Medical Physics |
| بيانات النشر: | Wiley, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Time Factors, Observation, Iterative reconstruction, Scintigraphy, effective risk, Imaging phantom, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Hounsfield scale, QUANTITATIVE IMAGING AND IMAGE PROCESSING, Image Processing, Computer-Assisted, medicine, Humans, Dosimetry, Research Articles, Mathematics, medicine.diagnostic_test, Radon transform, Phantoms, Imaging, business.industry, General Medicine, JAFROC, 030220 oncology & carcinogenesis, Radiography, Thoracic, CNR, Tomography, X-Ray Computed, Nuclear medicine, business, Jackknife resampling, Linear least squares, CT |
| الوصف: | Purpose: To evaluate nodule detection in an anthropomorphic chest phantom in computed tomography (CT) images reconstructed with adaptive iterative dose reduction 3D (AIDR3D) and filtered back projection (FBP) over a range of tube current-time product (mAs).\ud Methods: Two phantoms were used in this study: (i) an anthropomorphic chest phantom was loaded with spherical simulated nodules of 5, 8, 10 and 12mm in diameter and +100, -630 and -800 Hounsfied Units electron density; this would generate CT images for the observer study; (ii) a whole-body dosimetry verification phantom was used to ultimately estimate effective dose and risk according to the model of the BEIR VII committee. Both phantoms were scanned over a mAs range (10, 20, 30, and 40) while all other acquisition parameters remained constant. Images were reconstructed with both AIDR3D and FBP. 34 normal cases (no nodules) and 34 abnormal cases (containing 1-3 nodules, mean 1.35±0.54) cases were chosen for the observer study. Eleven observers evaluated images from all tube current-time product and reconstruction methods under the free-response paradigm. A crossed-modality jackknife alternative free-response operating characteristic (JAFROC) analysis method was developed for data analysis, averaging data over the two factors influencing nodule detection in this study: mAs and image reconstruction (AIDR3D or FBP). A Bonferroni correction was applied and the threshold for declaring significance was set at 0.025 to maintain the overall probability of Type I error at α = 0.05. Contrast-to-noise (CNR) was also measured for all nodules and evaluated by a linear least squares analysis.\ud Results: For random-reader fixed-case crossed-modality JAFROC analysis there was no significant difference in nodule detection between AIDR3D and FBP when data was averaged over mAs (F(1,10) = 0.08, p = 0.789). However, when data was averaged over reconstruction methods, a significant difference was seen between multiple pairs of mAs settings (F(3,30) = 15.96, p\ud Conclusion: No significant difference in nodule detection performance was demonstrated between images reconstructed with FBP and AIDR3D. Tube current-time product was found to influence nodule detection, though further work is required for dose optimisation. |
| وصف الملف: | application/pdf |
| تدمد: | 2473-4209 0094-2405 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb5fb8d2767aa53655b89c496464fb33Test https://doi.org/10.1118/1.4941017Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....bb5fb8d2767aa53655b89c496464fb33 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24734209 00942405 |
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