کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1883685 1043305 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A parametrization of the CT number of a substance and its use for stoichiometric calibration
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
A parametrization of the CT number of a substance and its use for stoichiometric calibration
چکیده انگلیسی

A method to carry out stoichiometric calibrations of CT scanners employed in radiotherapy treatment planning is proposed. The method is based on a simple parametrization of the CT number of a substance, which involves only two variables to describe the substance (electron density and one effective atomic number) and one parameter to describe the beam. The method was tested experimentally on a group of beams. A set of no tissue-like substances of known densities and elemental compositions were employed as calibrators. CT number-to-density curves (RED curves) were calculated with the proposed parametrization and compared to those measured with a commercial density phantom. Differences between the electron densities assigned by the calculated RED curves and the measured ones were in the range 0.009–0.019 (RMS). The proposed method may be employed to carry out accurate stoichiometric calibrations by using only one suitable substance as calibrator, not necessarily tissue-like.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica Medica - Volume 28, Issue 1, January 2012, Pages 33–42
نویسندگان
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