DOI QR코드

DOI QR Code

Noise and Image Quality Analysis of Brain CT Examination

두부 CT검사에서의 노이즈 및 화질분석

  • Choi, Seok-yoon (Department of Radiological Science, Catholic University of Pusan) ;
  • Im, In-chul (Department of Radiological Science, Dongeui University)
  • Received : 2019.08.07
  • Accepted : 2019.08.21
  • Published : 2019.08.31

Abstract

The purpose of this study was to find the best protocol for balance of image quality and dose in brain CT scan. Images were acquired using dual-source CT and AAPM water phantom, noise and dose were measured, and effective dose was calculated using computer simulation program ALARA(S/W). In order to determine the ratio of image quality and dose by each protocol, FOM (figure of merits) equation with normalized DLP was presented and the result was calculated. judged that the ratio of image quality and dose was excellent when the FOM maximized. Experimental results showed that protocol No. 21(120 kVp, 10 mm, 1.5 pitch) was the best, the organ with the highest effective dose was the brain(33.61 mGy). Among organs with high radiosensitivity, the thyroid gland was 0.78 mGy and breast 0.05 mGy. In conclusion, the optimal parameters and the organ dose in the protocol were also presented from the experiment, It may be helpful to clinicians who want to know the protocol about the optimum state of image quality and dose.

Keywords

References

  1. Kubo T, Ohno Y, Kauczor HU, Hatabu H. Radiation dose reduction in chest CT-Review of available options. Europe Journal of Radiology. 2014;83: 1953-61. https://doi.org/10.1016/j.ejrad.2014.06.033
  2. Kim HJ. Usefulness Evaluation of Application of Metallic Algorithm Reducing for Beam Hardening Artifact Occur in Typical Brain CT Image. Journal of the Korean Society of Radiology, 2017;11(1):389-95.
  3. Kwon SM, Kim JS. The Evaluation of Eye Dose and Image Quality According to The New Tube Current Modulation and shielding Techniques in Brain CT. Journal of the Korean Society of Radiology. 2015;9(5):279-85. https://doi.org/10.7742/jksr.2015.9.5.279
  4. Choi SY. Noise Reduction on Low Tube Voltage CT Images. Journal of the Korean Society of Radiology. 2017;11(1): 63-8. https://doi.org/10.7742/jksr.2017.11.1.63
  5. Lee CH, Lim CS. A study on Added Filters for Reduction of Radiation Exposure Dose in Skull A-P Projection. Journal of Korean Academia-Industrial cooperation Society. 2011;12(7):3117-22. https://doi.org/10.5762/KAIS.2011.12.7.3117
  6. Korea Centers for Disease Control and Prevention, http://www.cdc.go.kr/
  7. Hamberg LM, Rhea JT, Hunter GJ, THrall JH. Multi-detector row CT: radiation dose characteristics. Radiology. 2003;226:762-72. https://doi.org/10.1148/radiol.2263020205
  8. McNitt-Gray MF. AAPM/RSNA Physics tutorial for residents: topics in CT, radiation dose in CT, Radio graphics. 2002;22:1541-53.
  9. Commission of the European Communities (CEC). Quality Criteria for Computed Tomography, European Guidelines, European journal of clinical microbiology & infectious diseases 16262. Luxembourg;1999.
  10. Do KH, Sung DW. Strategies of computed tomography radiation dose reduction: justification and optimization. Journal of Korean Medcine Association. 2015;58(6):534-41. https://doi.org/10.5124/jkma.2015.58.6.534
  11. Hamwan K, Krisanachinda A, Pasawang P. The determination of patient dose from 18F-FDG PET/CT examination, Radiation Protection Dosimetry. 2010;141(1):50-5. https://doi.org/10.1093/rpd/ncq140
  12. Nickoloff EL, Alderson PO. Radiation exposure to patients from CT: reality public perception and policy. American Journal of Roentgenology. 2001;176:285-7. https://doi.org/10.2214/ajr.177.2.1770285
  13. Aldrich J, Williams J. Change in patient doses from radiological; examinations at the Vancouver general hospital. American Journal of College Radiology Protection. 2005;56(5):94-9.
  14. Golding SJ, Shrimpton PC. Radiation dose in CT: are we meeting the challenge. British Jounal of Radiology. 2002;75:1-4. https://doi.org/10.1259/bjr.75.889.750001
  15. Mahesh M, Fishman EK. CT dose reduction strategy: to modulate dose or not in certain patients. American Journal of College Radiology Protection. 2012;9:931-2. https://doi.org/10.1016/j.jacr.2012.09.021
  16. Yoon JH, Lee KW, Cho YK, Choi JW, Lee JI. Effective Dose Determination From CT Head & Neck Region. Journal of Radiological Science and Technology. 2011;34(2):105-16.