Home > Archives > IJSRST162638
Using Age and Weight Specific CT Protocol to Estimate Reference Effective Dose to Patients Undergoing CT Examination
Authors(4) :-Issahaku Shirazu, Y. B. Mensah, Cyril Schandorf, S. Y. Mensah
In x-ray computed tomography (CT), the most common parameters used to estimate and minimize patient dose is the CT dose index (CTDI) and DLP. The aim of the study is to serve as a reference values during QC for the purposes of QA in other to reduce doses to patients undergoing CT scan using the age and weight specific CT protocol set out by various manufacturers and other international organizations. This was done by recording CTDI and DLP values to patients within a specific age and weight bracket during scanning on the scanning console and on image data. The effective dose values represents an averaged dose to patients, hence the measurements are only an approximation of the dose to patient, these doses may be overestimated or underestimated by a factor of two or more with CTDI and DLP values in comparison with point dose values. CTDI and DLP were used to evaluate CT scanner output and estimating patient regional effective dose in this study. The estimated head CTDI scans base on the various protocol from all the hospitals increase from approximately 2.8mGy in newborns to approximately 8.7mGy in adults. Resulting with a variation of effective dose from 0.67mSv in new born to approximately 1.03mSv in oversize adults. Neonates head CT effective doses are higher than those for the normal adults except oversize adults as shown in Table 4.4. The chest, abdominal and pelvis CTDI values increases from 2.8, 2.5 and 2.7 mGy in neonates of approximately 3.4kg of weight to 19.84, 7.78 and 11.33mGy in adults of approximately 72.5kg of weight respectively. The estimated effective doses for neonates undergoing chest, abdomen and pelvis of the body CT were 0.83, 6.7, 4.87 and 5.52mSv, whereas those for normal-sized adults are 13.31, 4.61 and 5.34mSv respectively. Chest oversize patientsí examinations exceeded the recommended dose levels of 19.84mSv whiles the head, abdomen and pelvis were: 1.03, 7.16 and 5.98mSv respectively. It was concluded that patient body doses could be substantially minimized through careful selection of scanning parameters based on clinical indications of study, patient age, body size, and body region being examined. Additional dose reduction to superficial body regions would require the use of shielding materials.
Issahaku Shirazu, Y. B. Mensah, Cyril Schandorf, S. Y. Mensah
Paediatric Dose, Effective Dose, Abdomen, Pelvic, CTDI, Specific CT Protocol, Organ Dose, DLP
- United Nations Scientific Committee on Effects of Radiation Atomic Radiation (UNSCEAR). Sources and effects of ionizing radiation report to the general assembly. New York: United Nations; 2000.
- International Atomic Energy Agency (IAEA). Protection of patients in diagnostic and intervention radiology, nuclear medicine and radiotherapy. Proceeding of International Conference, Malaga, Spain, 26-30 March 2001; Vienna.
- International Commission on Radiological Protection (ICRP). Managing patient dose in computed tomography annals of ICRP publication 87; 30(4). Oxford: Pergamon Press; 2000.
- Muhogora WE, Nyanda AM, Lema US, Ngaile JE. Typical radiation doses to patients from some common x-ray examinations in Tanzania. Radiat Prot Dosim. 1999;82(4):301-305.
- Brenner DV, Elliston CD, Hall EJ, Berdon WE. Estimated risks of radiation fatal cancer from paediatric CT. Am J Roentgenol. 2001; 176:289-296.
- European Commission. European guidelines on quality criteria for computed tomography EUR 16262 EN, Luxemburg. Office for Official Publications of the European Communities; 1999.
- Jessen KA, Shrimpton PC, Geleijns J, Panzer W, Tosi G. Dosimetry for optimisation of patient protection in CT. Appl Radiat Isot. 1999; 50:165-172.
- International Electrotechnical Commission (IEC). Medical electrical equipment. Part 2-44: Particular requirements for the safety of X-ray equipment or computed tomography. IEC 60601-2-44. Geneva, Switzerland; 1999.
- Huda W, Scalzetti EM, Roskopf M. Effective dose to patients undergoing thoracic computed tomography examinations. Med Phys. 2000; 27(5):835-844.
- Nishizawa K, Maruyama T, Takayama M, Okada M, Hachiya J, Furuya Y. Determination of organ doses and effective dose equivalents from computed tomographic examination. Br J Radiol. 1991; 64:20-28.
- Donnelly LF, Emery KH, Brody AS, et al. Minimizing radiation dose for paediatric body applications of singledetector helical CT. Am J Roentgenol. 2001; 176:303-306.
- Starck G, Lonn L, Cederblad A, Forssell-Aronsson E, Sjostrom L, Alpsten M. A method to obtain the same levels of CT image noise for patients of various sizes to minimize radiation dose. Br J Radiol. 2002; 75:140-150.
Published in : Volume 3 | Issue 1 | January-February 2017
Date of Publication : 2017-02-28
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Page(s) : 191-196
Manuscript Number : IJSRST162638
Publisher : Technoscience Academy
PRINT ISSN : 2395-6011
ONLINE ISSN : 2395-602X
Cite This Article :
Issahaku Shirazu, Y. B. Mensah, Cyril Schandorf, S. Y. Mensah, "Using Age and Weight Specific CT Protocol to Estimate Reference Effective Dose to Patients Undergoing CT Examination", International Journal of Scientific Research in Science and Technology(IJSRST), Print ISSN : 2395-6011, Online ISSN : 2395-602X, Volume 3, Issue 1, pp.191-196 , January-February-2017
URL : http://ijsrst.com/IJSRST162638