Characteristics of Amorphous Selenium Detector for Monoenergetic X-ray Determined by Monte Carlo Simulation

Eun Jung Yun, Hyung Won Lee, Jae Sung Lee, Sang Hee Nam

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

Amorphous selenium (a-Se) has been proved to have excellent detective quantum efficiency, which suggests that a-Se would provide good image quality that is equivalent to or better than conventional film. We implemented a simulation model using Monte Carlo method to acquire the characteristics of detection material itself, not of whole detection system, to compare with conventional film or screen, and obtained PSF, LSF and MTF of photon absorption in a-Se relative to X-ray energy, thickness, and so on. First, we translated XCOM from Fortran into C++ language, which was needed to generate cross sections and attenuation coefficients to obtain path length and interaction type of photons. Using Monte Carlo simulation codes in Visual C++ incorporated with this program, total cross sections, attenuation coefficients, partial cross sections for incoherent and coherent scatterings, photoelectric absorption and pair production were obtained for photons with energy between 1keV and 100GeV. The Monte Carlo simulation codes developed in this study allowed the users to select a random number generator among four suggested ones in Numerical Recipes in C, Based on three interaction types occurring for photons in energy range of diagnostic X-ray (1-100keV), we estimated the position of interaction and the direction of scattered photons in a-Se. Via Fourier transformation of PSF and LSF, we obtained MTF. Density and thickness of a-Se detector was 4.26g/cm3 and 300 μm, respectively, and number of induced photons was 100,000. The percentage of absorbed photons in induced direction was 99.8% for 5keV and 86.4% in 30keV photons. Probability of interaction became higher for lower energy photon and in thicker a-Se.

Original languageEnglish
Pages444-445
Number of pages2
StatePublished - 1 Dec 2002
Event2002 IEEE Nuclear Science Symposium Conference Record - Norfolk, VA, United States
Duration: 10 Nov 200216 Nov 2002

Other

Other2002 IEEE Nuclear Science Symposium Conference Record
CountryUnited States
CityNorfolk, VA
Period10/11/0216/11/02

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Selenium
Photons
Detectors
X rays
Incoherent scattering
Coherent scattering
Monte Carlo simulation
Quantum efficiency
Image quality
Monte Carlo methods

Cite this

Yun, E. J., Lee, H. W., Lee, J. S., & Nam, S. H. (2002). Characteristics of Amorphous Selenium Detector for Monoenergetic X-ray Determined by Monte Carlo Simulation. 444-445. Paper presented at 2002 IEEE Nuclear Science Symposium Conference Record, Norfolk, VA, United States.
Yun, Eun Jung ; Lee, Hyung Won ; Lee, Jae Sung ; Nam, Sang Hee. / Characteristics of Amorphous Selenium Detector for Monoenergetic X-ray Determined by Monte Carlo Simulation. Paper presented at 2002 IEEE Nuclear Science Symposium Conference Record, Norfolk, VA, United States.2 p.
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abstract = "Amorphous selenium (a-Se) has been proved to have excellent detective quantum efficiency, which suggests that a-Se would provide good image quality that is equivalent to or better than conventional film. We implemented a simulation model using Monte Carlo method to acquire the characteristics of detection material itself, not of whole detection system, to compare with conventional film or screen, and obtained PSF, LSF and MTF of photon absorption in a-Se relative to X-ray energy, thickness, and so on. First, we translated XCOM from Fortran into C++ language, which was needed to generate cross sections and attenuation coefficients to obtain path length and interaction type of photons. Using Monte Carlo simulation codes in Visual C++ incorporated with this program, total cross sections, attenuation coefficients, partial cross sections for incoherent and coherent scatterings, photoelectric absorption and pair production were obtained for photons with energy between 1keV and 100GeV. The Monte Carlo simulation codes developed in this study allowed the users to select a random number generator among four suggested ones in Numerical Recipes in C, Based on three interaction types occurring for photons in energy range of diagnostic X-ray (1-100keV), we estimated the position of interaction and the direction of scattered photons in a-Se. Via Fourier transformation of PSF and LSF, we obtained MTF. Density and thickness of a-Se detector was 4.26g/cm3 and 300 μm, respectively, and number of induced photons was 100,000. The percentage of absorbed photons in induced direction was 99.8{\%} for 5keV and 86.4{\%} in 30keV photons. Probability of interaction became higher for lower energy photon and in thicker a-Se.",
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Yun, EJ, Lee, HW, Lee, JS & Nam, SH 2002, 'Characteristics of Amorphous Selenium Detector for Monoenergetic X-ray Determined by Monte Carlo Simulation' Paper presented at 2002 IEEE Nuclear Science Symposium Conference Record, Norfolk, VA, United States, 10/11/02 - 16/11/02, pp. 444-445.

Characteristics of Amorphous Selenium Detector for Monoenergetic X-ray Determined by Monte Carlo Simulation. / Yun, Eun Jung; Lee, Hyung Won; Lee, Jae Sung; Nam, Sang Hee.

2002. 444-445 Paper presented at 2002 IEEE Nuclear Science Symposium Conference Record, Norfolk, VA, United States.

Research output: Contribution to conferencePaperResearchpeer-review

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N2 - Amorphous selenium (a-Se) has been proved to have excellent detective quantum efficiency, which suggests that a-Se would provide good image quality that is equivalent to or better than conventional film. We implemented a simulation model using Monte Carlo method to acquire the characteristics of detection material itself, not of whole detection system, to compare with conventional film or screen, and obtained PSF, LSF and MTF of photon absorption in a-Se relative to X-ray energy, thickness, and so on. First, we translated XCOM from Fortran into C++ language, which was needed to generate cross sections and attenuation coefficients to obtain path length and interaction type of photons. Using Monte Carlo simulation codes in Visual C++ incorporated with this program, total cross sections, attenuation coefficients, partial cross sections for incoherent and coherent scatterings, photoelectric absorption and pair production were obtained for photons with energy between 1keV and 100GeV. The Monte Carlo simulation codes developed in this study allowed the users to select a random number generator among four suggested ones in Numerical Recipes in C, Based on three interaction types occurring for photons in energy range of diagnostic X-ray (1-100keV), we estimated the position of interaction and the direction of scattered photons in a-Se. Via Fourier transformation of PSF and LSF, we obtained MTF. Density and thickness of a-Se detector was 4.26g/cm3 and 300 μm, respectively, and number of induced photons was 100,000. The percentage of absorbed photons in induced direction was 99.8% for 5keV and 86.4% in 30keV photons. Probability of interaction became higher for lower energy photon and in thicker a-Se.

AB - Amorphous selenium (a-Se) has been proved to have excellent detective quantum efficiency, which suggests that a-Se would provide good image quality that is equivalent to or better than conventional film. We implemented a simulation model using Monte Carlo method to acquire the characteristics of detection material itself, not of whole detection system, to compare with conventional film or screen, and obtained PSF, LSF and MTF of photon absorption in a-Se relative to X-ray energy, thickness, and so on. First, we translated XCOM from Fortran into C++ language, which was needed to generate cross sections and attenuation coefficients to obtain path length and interaction type of photons. Using Monte Carlo simulation codes in Visual C++ incorporated with this program, total cross sections, attenuation coefficients, partial cross sections for incoherent and coherent scatterings, photoelectric absorption and pair production were obtained for photons with energy between 1keV and 100GeV. The Monte Carlo simulation codes developed in this study allowed the users to select a random number generator among four suggested ones in Numerical Recipes in C, Based on three interaction types occurring for photons in energy range of diagnostic X-ray (1-100keV), we estimated the position of interaction and the direction of scattered photons in a-Se. Via Fourier transformation of PSF and LSF, we obtained MTF. Density and thickness of a-Se detector was 4.26g/cm3 and 300 μm, respectively, and number of induced photons was 100,000. The percentage of absorbed photons in induced direction was 99.8% for 5keV and 86.4% in 30keV photons. Probability of interaction became higher for lower energy photon and in thicker a-Se.

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Yun EJ, Lee HW, Lee JS, Nam SH. Characteristics of Amorphous Selenium Detector for Monoenergetic X-ray Determined by Monte Carlo Simulation. 2002. Paper presented at 2002 IEEE Nuclear Science Symposium Conference Record, Norfolk, VA, United States.