Comparison of dosimetric properties among four commercial multi-detector computed tomography scanners

Ohno, Tomohiro; Araki, Fujio; Onizuka, Ryota; Hatemura, Masahiro; Shimonobou, Toshiaki; Sakamoto, Takashi; Okumura, Shuichiro; Ideguchi, Daichi; Honda, Kei; Kawata, Kenji

doi:10.1016/j.ejmp.2017.02.007

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…where (μ en /ρ) w air is the ratio of the mean mass energy-absorption coefficients for water to air. Using equations ( 3), (4), and (5), the beam quality conversion factor for kilovoltage x-ray beams Q x to a 60 Co beam is expressed by Hioki et al (2014) and Ohno et al (2014Ohno et al ( , 2015Ohno et al ( , 2017…”

Section: Co Dwmentioning

confidence: 99%

Ionization chamber dosimetry based on ⁶⁰Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams

2018

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The purpose of this study was to develop a new ionization chamber dosimetry formalism for diagnostic kilovoltage x-ray beams based on a Co absorbed dose-to-water calibration coefficient [Formula: see text]. To validate the new chamber dosimetry, 39 fluence spectra of kilovoltage x-rays were calculated, using a SpekCalc program, for Al half-value-layer (Al-HVL) values of 1.4-8.5 mm and tube voltages of 50-137.6 kVp. We used these spectra to calculate the beam quality conversion factor [Formula: see text] for kilovoltage x-ray beams Q to a Co beam for a PTW 30013 Farmer ionization chamber in a reference geometrical setup (depth = 1 cm in water, field size = 20 × 20 cm). The absorbed dose to water for kilovoltage x-rays was obtained using [Formula: see text] and [Formula: see text]. Meanwhile, the water surface dose based on the air kerma calibration coefficient N was obtained using a Monte Carlo-calculated correction factor CF (corresponding to [Formula: see text] in AAPM TG-61) for the 39 x-ray fluence spectra. The absorbed dose based on [Formula: see text] was validated by comparing the water surface dose for the 39 x-ray fluence spectra with the water surface dose based on N . The water surface dose based on [Formula: see text] was obtained using Monte Carlo-calculated percentage depth doses. For Al-HVL ranging from 1.4 to 8.5 mm, [Formula: see text] ranged from 0.884 to 0.956 and CF ranged from 1.264 to 1.663. The water surface dose based on [Formula: see text] for the x-ray fluence spectra was 1.0% higher on average than that based on N , except for Al-HVLs of 1.4 and 1.5 mm and 1% was within their uncertainty ranges. Therefore, it is possible to use the absorbed dose-to-water value based on [Formula: see text] instead of on N . With the new chamber dosimetry, the chamber reading can be easily converted to the absorbed dose using [Formula: see text] and the calculated [Formula: see text].

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Section: Co Dwmentioning

confidence: 99%

Ionization chamber dosimetry based on ⁶⁰Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams

2018

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Practical dosimetry procedure of air kerma for kilovoltage X-ray imaging in radiation oncology using a 0.6-cc cylindrical ionization chamber with a cobalt absorbed dose-to-water calibration coefficient

Tachibana

Takahashi

Nishiyama³

et al. 2022

Radiol Phys Technol

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Determination of an ionization chamber response using quality index for kilovoltage x-ray beams

Araki

2021

Radiation Physics and Chemistry

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Comparison of dosimetric properties among four commercial multi-detector computed tomography scanners

Cited by 3 publications

References 19 publications

Ionization chamber dosimetry based on ⁶⁰Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams

Ionization chamber dosimetry based on ⁶⁰Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams

Practical dosimetry procedure of air kerma for kilovoltage X-ray imaging in radiation oncology using a 0.6-cc cylindrical ionization chamber with a cobalt absorbed dose-to-water calibration coefficient

Determination of an ionization chamber response using quality index for kilovoltage x-ray beams

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Comparison of dosimetric properties among four commercial multi-detector computed tomography scanners

Cited by 3 publications

References 19 publications

Ionization chamber dosimetry based on 60Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams

Ionization chamber dosimetry based on 60Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams

Practical dosimetry procedure of air kerma for kilovoltage X-ray imaging in radiation oncology using a 0.6-cc cylindrical ionization chamber with a cobalt absorbed dose-to-water calibration coefficient

Determination of an ionization chamber response using quality index for kilovoltage x-ray beams

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Ionization chamber dosimetry based on ⁶⁰Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams

Ionization chamber dosimetry based on ⁶⁰Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams