Optimization of exposure parameters in full field digital mammography using figure of merit

Laila Suryani Elias, and Eng, May Lin and Ang, Wee Chin and Abd Aziz Tajuddin, and Shantini A. Arasaratnam, and Suraya Aziz, and Khairul Osman, and Kanaga Kumari Chelliah, (2010) Optimization of exposure parameters in full field digital mammography using figure of merit. Sains Malaysiana, 39 (2). pp. 299-303. ISSN 0126-6039


Official URL: http://www.ukm.my/jsm/english_journals/vol39num2_2...


Mammography is used as a screening tool for early detection of breast cancer. However, the radiation dose used should be as low as possible to minimize any effects on asymptomatic woman while maintaining the diagnostic value of the image as mammography is done annually. This study was done to determine the optimum exposure parameter in exposure control mode (AEC) for two combinations of anode/filter which were molybdenum/molybdenum (Mo/Mo) and molybdenum/rhodium (Mo/Rh) using the Lorad Selenia digital mammography system at the Women’s Breast Clinic, National Cancer Society (NCS). A CIRS012A mammography research of phantom 4 cm thickness with 50% glandularity was exposed in the cranio-caudal projection. TLD 100H was used to measure the entrance surface air kerma (ESAK). The AGD values were then calculated from the ESAK values, incorporating three correction factors (g, c and s) according to Euref protocol. Image quality was evaluated using signal to noise ratio (SNR). Figure of Merit (FOM) which is the ratio of the square of SNR to the AGD shows that 30 kVp is the optimum exposure parameter for a 4 cm thickness phantom with the use of Mo/Rh and Mo/Mo anode/filter combination. Non-parametric Spearman correlation test showed a negative linear relationship between AGD and SNR with increasing tube voltage for both anode/filters.

Item Type:Article
Keywords:Average glandular dose; CIRS012A phantom; exposure; full field digital mammography
Journal:Sains Malaysiana
ID Code:7336
Deposited By: Mr Fazli Nafiah -
Deposited On:22 Jul 2014 12:00
Last Modified:14 Dec 2016 06:43

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