Doh-Yun Jang BENG, Presenter: Nothing to Disclose

Do-Il Kim, Abstract Co-Author: Nothing to Disclose

ChunJoo Park BENG, Abstract Co-Author: Nothing to Disclose

Tae-Eun Choi, Abstract Co-Author: Nothing to Disclose

Jin-Ho Lee, Abstract Co-Author: Nothing to Disclose

Hyoung-Koo Lee PhD, Abstract Co-Author: Nothing to Disclose

The purpose of present study was to predict the performance of mammographic antiscatter grids through by deriving empirical formula of Transmission of primary radiation(Tp), and Transmission of total radiation(Tt) which are necessary to valuate its performance.

Designing parameters of the antiscatter grid for deriving the empirical formula were height of lead strip, thickness of carbon interspace, and thickness of lead strip. Tp and Tt values were measured through by Monte Carlo simulation, and 61 different types of grids were used to derive the empirical formula. The range of designing parameters were 0.6~1.8mm, 100~300μm, 20~40μm for height of lead strip, thickness of carbon interspace, and thickness of lead strip respectively. X-ray spectrum used in Monte Carlo simulation was attained from SPEC-78 and was almost correspondent to the experiments from the real X-ray equipment. The empirical formula was derived by fixing one of designing parameters and illustrating the relationship of other two. The correlations of each were verified and taken into account.

The empirical formula derived from 61 grids had relative errors(root mean square errors) of 0.212% in Tp, and 3.109% in Tt to the result from Monte carlo simulation.

The present empirical formula can compute Contrast Improvement Factor and Bucky Factor(Grid Exposure Factor) which are frequently used in valuating the performance of antiscatter grid, easily in hand. Thus the empirical formula can substitute the bored, complex grid test and simulation. Also it is expected to help in predicting the performance of grid to be produced.

From the empirical formula we have derived, designing factors of Grid which reduces patent's exposure as well as enhancing the image quality can be proposed.

Jang, D, Kim, D, Park, C, Choi, T, Lee, J, Lee, H, Performance Evaluation of Mammographic Antiscatter Grids : Empirical Formula and Monte Carlo Simulation Studies.  Radiological Society of North America 2007 Scientific Assembly and Annual Meeting, November 25 - November 30, 2007 ,Chicago IL. http://archive.rsna.org/2007/5015308.html