Journal of Medical Physics
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Year : 2015  |  Volume : 40  |  Issue : 3  |  Page : 170-175

Cost-effective pediatric head and body phantoms for computed tomography dosimetry and its evaluation using pencil ion chamber and CT dose profiler

1 Department of Applied Science, PSG College of Technology, Coimbatore, India
2 Department of Medical Physis, PSG Hospitals, Coimbatore, India
3 Department of Physis, PSG Institute of Technology and Applied Research, Coimbatore, Tamil Nadu, India
4 Department of Radiology, PSG Hospitals, Coimbatore, India

Correspondence Address:
K N Govindarajan
Professor of Medical Physics, P. S. Govindasamy Hospitals, Coimbatore - 641 004, Tamil Nadu, India.
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Source of Support: Atomic Energy Regulatory Board (AERB), PSG College of Technology., Conflict of Interest: There are no conflicts of interest.

DOI: 10.4103/0971-6203.165073

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In the present work, a pediatric head and body phantom was fabricated using polymethyl methacrylate (PMMA) at a low cost when compared to commercially available phantoms for the purpose of computed tomography (CT) dosimetry. The dimensions of head and body phantoms were 10 cm diameter, 15 cm length and 16 cm diameter, 15 cm length, respectively. The dose from a 128-slice CT machine received by the head and body phantom at the center and periphery were measured using a 100 mm pencil ion chamber and 150 mm CT dose profiler (CTDP). Using these values, the weighted computed tomography dose index (CTDIw) and in turn the volumetric CTDI (CTDIv) were calculated for various combinations of tube voltage and current-time product. A similar study was carried out using standard calibrated phantom and the results have been compared with the fabricated ones to ascertain that the performance of the latter is equivalent to that of the former. Finally, CTDIv measured using fabricated and standard phantoms were compared with respective values displayed on the console. The difference between the values was well within the limits specified by Atomic Energy Regulatory Board (AERB), India. These results indicate that the cost-effective pediatric phantom can be employed for CT dosimetry.

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