Browse > Article
http://dx.doi.org/10.17946/JRST.2015.38.3.08

A Comparative Study of CTDI and the Effective Dose and the SNR according to the Area in the Abdominal CT  

Choi, Sung-Jun (Department of Radiologic Science, Shinhan University)
Kang, Jun-Guk (Department of Radiologic Science, Shinhan University)
Kim, Su-In (Department of Radiologic Science, Shinhan University)
Kim, Youn-Ho (Department of Radiologic Science, Shinhan University)
Lee, Do-Gyeong (Department of Radiologic Science, Shinhan University)
Jung, Jin-Gyung (Department of Radiologic Science, Shinhan University)
Cho, Ar-A (Department of Radiologic Science, Shinhan University)
Jang, Jae-Hyeok (Department of Radiologic Science, Shinhan University)
Kweon, Dae-Cheol (Department of Radiologic Science, Shinhan University)
Publication Information
Journal of radiological science and technology / v.38, no.3, 2015 , pp. 245-252 More about this Journal
Abstract
To obtain the best SNR (signal to noise ratio) due to changes in CTDI (computed tomography dose index) made for the purpose of setting the optimum image obtained by reducing the dose in abdominal CT. Abdominal CT scans of 59 patients a $400-499cm^2$ (n = 12), $500-599cm^2$ (n = 21), $600-699cm^2$ (n = 17), $700-799cm^2$ (n = 9) were separated by four groups and the effective dose was used in the Excel to get the area of the patient using the ImageJ program. Patients of CTDI, DLP, SNR, the effective dose were analyzed. Abdominal CT area was increased to 13 mGy in CTDI is 7.3 mGy, DLP to 732 in $394.4mGy{\cdot}cm$, also effective dose was 5.9 mSv increase in 11mSv. SNR is 15 dB was maintained at 12.7. CTDI according to the average of the abdominal area of 8.9 mGy, the average of the DLP was $481.54mGy{\cdot}cm$, the effective dose is calculated to be 7.2 mSV. Effective dose was calculated by multiplying the load factor of DLP in the abdomen showed no statistically significant difference of (p < .05), there was a significant difference in SNR (p > . 05). To improve image quality of abdominal CT scan image in consideration of the CTDI according to the volume of the patient it should be able to reduce the radiation exposure of the patients.
Keywords
Abdomen; CT; CTDI; Effective Dose; SNR;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Jung MY, Kweon DC, Kwon SI: Effectiveness of bismuth shield to reduce eye lens radiation dose using the photoluminescence dosimetry in computed tomography, J Korean Soc Radiol Technol, 32(3), 307-312, 2009
2 Yoo BG, Kweon DC, Lee JS, Jang KJ, Jeon SH, Kim YS: Comparison radiation dose of Z-axis automatic tube current modulation technique with fixed tube current multi-detector row CT scanning of lower extremity venography, J Radiat Prot, 32(3), 123-133, 2007
3 Hricak H, Brenner DJ, Adelstein SJ, Frush DP, Hall EJ, Howell RW, et al. Managing radiation use in medical imaging: a multifaceted challenge, Radiology, 258, 889-905, 2011   DOI
4 Mettler FA Jr, Bhargavan M, Faulkner K, Gilley DB, Gray JE, Ibbott GS, et al. Radiologic and nuclear medicine studies in the United States and worldwide: frequency, radiation dose, and comparison with other radiation sources-1950-2007. Radiology 2009;253:520-531   DOI
5 Brenner DJ, Elliston CD: Estimated radiation risks potentially associated with full-body CT screening, Radiology, 232(8),735-738, 2004   DOI
6 Brenner DJ: Radiation risks potentially associated with low-dose CT screening of adult smokers for lung cancer, Radiology, 231(2), 440-445, 2004   DOI
7 Yoshinaga S, Mabuchi K, Sigurdson AJ, Doody MM, Ron E: Cancer risks among radiologists and radiologic technologists review of epidemiologic studies, Radiology, 233(2), 313-321, 2004   DOI
8 Kweon DC, Lee JS, You BG: Radiation dose reducing effect during the AEC system in the chest and abdomen of the MDCT scanning, The Journal of the Korea Contents Association, 9(3), 225-231, 2009   DOI
9 European Commission. European guidelines on quality criteria for computed tomography (EUR 16262 EN). Luxembourg, Luxembourg: European Commission, 2000
10 Mulkens T H, Bellinck P, Baeyaert M, Ghysen D, Van Dijck X, Mussen E, Venstermans C, Termote JL: Use of an automatic exposure control mechanism for dose optimization in multi-detector row CT examinations: clinical evaluation, Radiology, 237(1), 213-233, 2005   DOI
11 Kalra MK, Maher MM, Toth TL, Strategies for CT radiation dose optimization, Radiology, 230, 619-628, 2004   DOI
12 Huda W, Scalzetti EM, Levin G: Technique factors and image quality as functions of patient weight at abdominal CT, Radiology, 217, 430-435, 2000   DOI
13 Kweon SO, Dong KR, Kweon DC, Goo EH, Choi J, Chung WK: Estimate of radiation does in MDCT using patient weight, Korean J Med Phys 21(3), 246-252, 2010
14 Jung B, Mahnken AH, Stargardt A, Simon J, Flohr TG, Schaller S, Koos R, Gunther RW, Wildberger JE: Individual weight CT adapted examination protocol in retrospectively ECG-gated MSCT of the heart, Eur Radiol, 13(12), 2560-2566, 2003   DOI
15 Irle T, Inoue H: Individual modulation of the tube current-seconds to achieve similar levels of image noise in contrast-enhanced abdominal CT, Am J Roentgenol, 184(5), 1514-1518, 2005   DOI
16 Bae KT, Seeck BA, Hildebolt CF, Tao CF, Zhu F, Kanematsu M, Woodard PK: Contrast enhancement in cardiovascular MDCT: effect of body weight, height, body surface area, body mass index, and obesity, Am J Roentgenol, 190(3), 777-784, 2008   DOI
17 Christner JA1, Zavaletta VA, Eusemann CD, Walz-Flannigan AI, McCollough CH: Dose reduction in helical CT: dynamically adjustable z-axis X-ray beam collimation. Am J Roentgenol, 194(1), W49-55, 2010   DOI
18 Starck G, Lonn L, Cederblad A, Forssell-Aronsson E, Sjostrom L, Alpsten M: A method to obtain the same level of CT image noise for patients of various sizes, to minimize radiation dose, Br J Radiol, 75(890), 140-150, 2002   DOI
19 Boone JM, Geraghty EM, Seibert JA, Wootton-Gorges SL: Dose reduction in pediatric CT: a rational approach, Radiology, 228(2), 352-360, 2003   DOI