A TLD based method to estimate bowtie filter shape in PET/CT

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AHMADI N.; Nasrabadi M.N.; KARIMIAN A.; RAHMIM A.

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Journal Paper

Paper Information

Journal: International Journal of Radiation Research Year:2017 | Volume:15 | Issue:4 Page(s): 383-390

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Title

A TLD based method to estimate bowtie filter shape in PET/CT

Author(s)

AHMADI N. | Nasrabadi M.N. | KARIMIAN A. | RAHMIM A. | Issue Writer Certificate

Keywords

PET/CT

bowtie filter

TLD dosimeter

dosimetry

Abstract

Background: In CT systems, the machine u lizes a bow e filter to shape the X-ray beam and remove lower energy photons. The shape of this bow e filter is complicated and its geometry is o! en not available in detail. These renders the CT dose index (CTDI) to have different values in measurement versus Monte Carlo simula on studies and other analy cal calcula ons especially in dosimetry of internal organs. In exis ng literature, the bow e filter shape is extracted by using expensive sensors Materials and Methods: In the present work, the shape of the bow e filter of the Biograph 6 PET/CT was derived by using Thermolumenecence dosimeters (TLDs). Subsequently, to evaluate the accuracy of the body bow e filter shape as generated by TLDs, Monte Carlo simula on of CT was performed. 16 X-ray sources in various angles were used within the Monte Carlo code (MCNP-4C) to simulate the CT sec on of the PET-CT Biograph 6 system and to calculate dose. Results: The rela ve difference between simulated and measured CTDI value for the PET/CT Siemens Biograph 6 at 80, 110 and 130 kVp were 4. 2, 2. 9 and 2. 3%, respec vely. Conclusion: In this study, we demonstrate that it is possible to calculate the bow e filter shape by using an inexpensive TLD method. The results showed that it is possible to determine the shape of the bow e filter in PET/CT using TLDs with acceptable accuracy.

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APA: Copy

AHMADI, N., Nasrabadi, M.N., KARIMIAN, A., & RAHMIM, A.. (2017). A TLD based method to estimate bowtie filter shape in PET/CT. INTERNATIONAL JOURNAL OF RADIATION RESEARCH, 15(4), 383-390. SID. https://sid.ir/paper/286894/en

Vancouver: Copy

AHMADI N., Nasrabadi M.N., KARIMIAN A., RAHMIM A.. A TLD based method to estimate bowtie filter shape in PET/CT. INTERNATIONAL JOURNAL OF RADIATION RESEARCH[Internet]. 2017;15(4):383-390. Available from: https://sid.ir/paper/286894/en

IEEE: Copy

N. AHMADI, M.N. Nasrabadi, A. KARIMIAN, and A. RAHMIM, “A TLD based method to estimate bowtie filter shape in PET/CT,” INTERNATIONAL JOURNAL OF RADIATION RESEARCH, vol. 15, no. 4, pp. 383–390, 2017, [Online]. Available: https://sid.ir/paper/286894/en

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