Volume computed tomography dose index (CTDIvol) and size-specific dose estimate (SSDE) for tube current modulation (TCM) in CT scanning

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Anam c.; Haryanto f.; Widita r.; Arif i.; Dougherty g.; MCLEAN D.

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Journal: International Journal of Radiation Research Year:2018 | Volume:16 | Issue:3 Page(s): 289-297

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Title

Volume computed tomography dose index (CTDIvol) and size-specific dose estimate (SSDE) for tube current modulation (TCM) in CT scanning

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Keywords

Volume CT dose index (CTDIvol)

size-specific dose estimate (SSDE)

water equivalent diameter (Dw)

tube current modulation (TCM)

Abstract

Background: In the tube current modula on (TCM) technique, tube current is changed dynamically during the scanning process. To quan fy the effect of a dynamic tube current, a dis nct calculator is needed to es mate the CT output radia on dose in terms of volume CT dose index (CTDIvol) and individual pa ent dose in terms of size-specific dose es mate (SSDE). This study developed a specific calculator for CT scanning using the TCM technique. Materials and Methods: The tube current was extracted from the DICOM header for every slice, and averaged over the scan length. The water equivalent diameter (Dw) and SSDE values were calculated for each tube rota on. The so*ware was retrospec vely applied to 57 pa ents who had undergone abdominal and thoracic CT examina ons using a mul-detector CT, the Somatom Emo on 6. Results: The differences between the calculated CTDIvol and the CTDIvol reported by the CT scanner were 4. 4 ± 1. 2% and 6. 0 ± 2. 0% for abdominal and thoracic examina ons, respec vely. The average tube current was found to be linearly correlated with Dw with R2 values of 0. 707 and 0. 696 for abdominal and thoracic examina ons, respec vely. The average tube current was also linearly and strongly correlated with the SSDE with R2 values of 0. 941 and 0. 887 for abdominal and thoracic examina ons, respec vely. Conclusion: Calculator for es ma ng CTDIvol and SSDE specifically for TCM in CT scanning has been successfully developed. The difference between calculated CTDIvol values using this calculator and reported CTDIvol values were less than 10%.

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APA: Copy

Anam, c., Haryanto, f., Widita, r., Arif, i., Dougherty, g., & MCLEAN, D.. (2018). Volume computed tomography dose index (CTDIvol) and size-specific dose estimate (SSDE) for tube current modulation (TCM) in CT scanning. INTERNATIONAL JOURNAL OF RADIATION RESEARCH, 16(3), 289-297. SID. https://sid.ir/paper/286748/en

Vancouver: Copy

Anam c., Haryanto f., Widita r., Arif i., Dougherty g., MCLEAN D.. Volume computed tomography dose index (CTDIvol) and size-specific dose estimate (SSDE) for tube current modulation (TCM) in CT scanning. INTERNATIONAL JOURNAL OF RADIATION RESEARCH[Internet]. 2018;16(3):289-297. Available from: https://sid.ir/paper/286748/en

IEEE: Copy

c. Anam, f. Haryanto, r. Widita, i. Arif, g. Dougherty, and D. MCLEAN, “Volume computed tomography dose index (CTDIvol) and size-specific dose estimate (SSDE) for tube current modulation (TCM) in CT scanning,” INTERNATIONAL JOURNAL OF RADIATION RESEARCH, vol. 16, no. 3, pp. 289–297, 2018, [Online]. Available: https://sid.ir/paper/286748/en

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