Radiation Dose for Multiregion CT Protocols: Challenges and Limitations
| Autor: | Subba R. Digumarthy, Mannudeep K. Kalra, Rachel Vining, Kalpana M. Kanal, Ramandeep Singh, Timothy P. Szczykutowicz, Fatemeh Homayounieh |
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| Rok vydání: | 2019 |
| Předmět: |
Adult
Male Radiography Abdominal Tomography Scanners X-Ray Computed Chest ct Radiation Dosage Ct dose index 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Abdomen examinations Retrospective analysis Humans Medicine Radiology Nuclear Medicine and imaging Retrospective Studies Adult patients business.industry Radiation dose General Medicine body regions 030220 oncology & carcinogenesis Female Radiography Thoracic Tomography X-Ray Computed Nuclear medicine business |
| Zdroj: | American Journal of Roentgenology. 213:1100-1106 |
| ISSN: | 1546-3141 0361-803X |
| DOI: | 10.2214/ajr.19.21201 |
| Popis: | OBJECTIVE. The purpose of this study was to devise a method for classification of individual chest and abdomen-pelvis CT doses for multiregion CT. MATERIALS AND METHODS. A retrospective analysis of volume CT dose index (CTDIvol) and dose-length product (DLP) associated with chest (150 adult patients), abdomen-pelvis (150 patients), and multiregion combined chest-abdomen-pelvis CT (210 patients; 60 single-run chest-abdomen-pelvis CT; 150 split-run with separate chest and abdomen-pelvis CT). All 510 CT examinations were performed with one of four MDCT scanners (64-, 64-, 128-, 256-MDCT). CTDIvol, DLP, and scan length were recorded. Scan lengths were obtained for these 510 CT examinations and for an additional 7745 examinations of patients at another institution. Data were analyzed by ANOVA and ROC analysis. RESULTS. The respective DLPs (chest, 258-381 mGy · cm; abdomen-pelvis, 360-433 mGy · cm; single-run chest-abdomen-pelvis, 595-636 mGy · cm) and scan lengths (chest, 31-33 cm; abdomen-pelvis, 45-46 cm; single-run chest-abdomen-pelvis, 63-65 cm) for chest, abdomen-pelvis, and multiregion combined chest-abdomen-pelvis CT were significantly different (p 0.05). ROC analysis of chest and abdomen examinations showed an ideal scan length threshold of 38 cm to differentiate abdomen-pelvis CT from chest CT with accuracy of 97.39% and an AUC of 0.9764. CONCLUSION. Despite interscanner variabilities in CT radiation doses, shorter scan length for chest than for abdomen-pelvis CT enables accurate binning of radiation doses for split-run combined chest-abdomen-pelvis CT. |
| Databáze: | OpenAIRE |
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