International Journal of Radiation Research
نشریه پرتو پژوه
Int J Radiat Res
Basic Sciences
http://ijrr.com
79
journal79
2322-3243
2345-4229
10.61186/ijrr
en
jalali
1397
4
1
gregorian
2018
7
1
16
3
online
1
fulltext
en
Volume computed tomography dose index (CTDIvol) and size-specific dose estimate (SSDE) for tube current modulation (TCM) in CT scanning
Radiation Biology
Radiation Biology
تحقيق بديع
Original Research
<div style="text-align: justify;">Background: In the tube current modulation (TCM) technique, tube current is changed dynamically during the scanning process. To quantify the effect of a dynamic tube current, a distinct calculator is needed to estimate the CT output radiation dose in terms of volume CT dose index (CTDI<sub>vol</sub>) and individual patient dose in terms of size-specific dose estimate (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 (D<sub>w</sub>) and SSDE values were calculated for each tube rotation. The software was retrospectively applied to 57 patients who had undergone abdominal and thoracic CT examinations using a multi-detector CT, the Somatom Emotion 6. Results: The differences between the calculated CTDI<sub>vol</sub> and the CTDI<sub>vol</sub> reported by the CT scanner were 4.4 ± 1.2% and 6.0 ± 2.0% for abdominal and thoracic examinations, respectively. The average tube current was found to be linearly correlated with D<sub>w</sub> with R<sup>2</sup> values of 0.707 and 0.696 for abdominal and thoracic examinations, respectively. The average tube current was also linearly and strongly correlated with the SSDE with R<sup>2</sup> values of 0.941 and 0.887 for abdominal and thoracic examinations, respectively. Conclusion: Calculator for estimating CTDI<sub>vol</sub> and SSDE specifically for TCM in CT scanning has been successfully developed. The difference between calculated CTDI<sub>vol</sub> values using this calculator and reported CTDI<sub>vol</sub> values were less than 10%.</div>
Volume CT dose index (CTDIvol), size-specific dose estimate (SSDE), water equivalent diameter (Dw), tube current modulation (TCM).
289
297
http://ijrr.com/browse.php?a_code=A-10-1-728&slc_lang=en&sid=1
C.
Anam
anam@fisika.undip.ac.id
7900319475328460012347
7900319475328460012347
Yes
Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, Indonesia
F.
Haryanto
7900319475328460012348
7900319475328460012348
No
Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Indonesia
R.
Widita
7900319475328460012349
7900319475328460012349
No
Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Indonesia
I.
Arif
7900319475328460012350
7900319475328460012350
No
Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Indonesia
G.
Dougherty
7900319475328460012351
7900319475328460012351
No
Department of Applied Physics and Medical Imaging, California State University Channel Islands, Camarillo, CA 93012, USA
D.
McLean
7900319475328460012352
7900319475328460012352
No
Department of Medical Physics and Radiation Engineering, The Canberra Hospital, Australia