The Precision of Half-value Layer Measurement on Mammography

Ishii, Rie; Yoshida, Akira; Ishii, Mie; Fujimoto, Shiho; Henmi, Noriko

doi:10.6009/jjrt.67.1533

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…(5) In contrast, Ishii et al reported that for quality control, HVL should be measured using the same part of the same plate in the same filter set. (6) The European Reference Protocol for the Quality Control of the Physical and Technical Aspects of Digital Breast Tomosynthesis Systems (EUREF) guidelines (version 1.01, 2016) state that HVL should be measured with the X-ray tube fixed. (7) However, in actual DBT imaging, the X-ray tube is moved in a circular arc during imaging; therefore, measuring HVL with a mammography system equipped with a DBT requires the use of the device's onboard control mode, making it difficult to easily perform daily measurement in clinical practice.…”

Section: Introductionmentioning

confidence: 99%

Half-value Layer Measurement Method for Routine Management of Digital-breast-tomosynthesis-equipped Breast Radiography Systems

Nakamura¹,

Suzuki²,

Kato³

et al. 2022

Sensors and Materials

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With the increasing use of digital breast tomosynthesis imaging, the accuracy and quality control of mammography systems is gaining importance because of the need for high image stability and quality. We focused on the accuracy and quality control of mammography systems using digital breast tomosynthesis and proposed a simple method of maintaining and controlling the accuracy of half-value layer (HVL) measurements. The European Reference Protocol for the Quality Control of the Physical and Technical Aspects of Digital Breast Tomosynthesis Systems guidelines state that HVL measurements should be performed annually; however, this would not reveal daily changes in X-ray output. Changes in HVL are important indicators for determining changes in tube voltage and considering radiation doses associated with radiography. We investigated a simple control method to measure HVL by photographing an aluminium step for routine quality control of mammography systems. The proposed HVL measurement on the aluminium step enables HVL measurement for short-term control. Moreover, it is inexpensive and allows for a straightforward evaluation of X-ray quality. Thus, this method can be used for simpler routine equipment management as the presence or absence of fluctuations can be confirmed with a single image of the aluminium step and by determining the dose.

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Section: Introductionmentioning

confidence: 99%

Half-value Layer Measurement Method for Routine Management of Digital-breast-tomosynthesis-equipped Breast Radiography Systems

Nakamura¹,

Suzuki²,

Kato³

et al. 2022

Sensors and Materials

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“…However, in the case of semiconductor dosimeters, the response varies depending on the energy of the x-rays [19]. For mammography, there are many reports that have indicated that the response changes significantly owing to differences in x-ray energy, and that the target-filter combination is limited [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Characteristic evaluation of a simple hand-made semiconductor dosimeter for mammography

Erika¹,

Yamashita²,

Sato³

2021

J. Radiol. Prot.

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Daily quality control of mammography equipment is important for providing optimal images and determining appropriate doses. To popularise dosimeters, the Measurement Division, the Japanese Society of Radiological Technology hold a seminar on making simple dosimeters. At this seminar, a hand-made dosimeter for mammography (HD-M) can be made at low cost. However, HD-Ms employ semiconductors, and their energy responses are subject to significant variations. This investigation involved the determination of precautions when using HD-Ms, examining their energy response characteristics and measurable energy ranges. HD-M has four types of selectors for response correction. When the selector and the tube voltage were equal, the HD-M readings matched that of the ionisation chamber within 5%. However, in case of target filter combinations and measuring tube voltages that the selector does not support, the HD-M readings differed by up to 53% from the ionisation chamber values. HD-M may use different measurement circuits and semiconductor elements depending on the time of the seminar. In this study, it was clarified that the correction factor k, which is the average value of the ratio of the measured value of the ionisation chamber dosimeter to the measured value of HD-M, changes from 0.62 to 1.53 depending on irradiation conditions such as the combination of target filters and the tube voltage. It was demonstrated that HD-M functions sufficiently as a dosimeter for daily management by determining the correction factor using the method proposed in this study.

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“…One of those factors affects the radiation quantity is HVL and plays an important role for the glandular dose investigations. On the other hand, it should be assures that radiation magnitude and radiation quality are within appropriate limits during the mammographic imaging process (6). The HVL of an X-ray beam can be calculated from measurements of air kerma with and without aluminium filters in the beam, or measured directly using a solid-state dosimetry system (7).…”

Section: Introductionmentioning

confidence: 99%

Assessment of MCNPX Monte Carlo Code for Absorbed Dose Calculations in Mammogarphy Examination

Tekın¹,

Mesbahi²,

Singh³

et al. 2017

AKU-J. Sci. Eng.

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Introduction: This study aimed to investigate capabities of MCNPX monte carlo code for calculations of average absorbed dose in a breast phantom during mammography examination. Also, the effect of tube voltage and breast thickness on absorbed dose was determined by using Monte carlo method. Obtained HVL values were found to be comparable with experimental results and available Monte Carlo results. Thus, validated simulation setup has been used for investigation of average absorbed dose in a %50-%50 grandular-adipose breast phantom. Results: Our calculated results was consistent with the previous studies and our MC model was validated. The results showed that changing tube voltage from 26 to 32 kV leads to about 4 times increase in breast dose. While increasing breast thick ness from 2 to 5 cm results in 1.6 times higer dose to breast. Conclusion: It can concluded that the breast recieved dose depends strongly beam quality and breast thickness. Our modeling using MCNPX can be used future dosimteric studies concering breast dose investigations in mamograpgy examinations. Mamografi Çekimlerinde Absorbe Doz Hesaplamaları için MCNPX Monte Carlo Kodunun Değerlendirilmesi

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The Precision of Half-value Layer Measurement on Mammography

Cited by 9 publications

References 6 publications

Half-value Layer Measurement Method for Routine Management of Digital-breast-tomosynthesis-equipped Breast Radiography Systems

Half-value Layer Measurement Method for Routine Management of Digital-breast-tomosynthesis-equipped Breast Radiography Systems

Characteristic evaluation of a simple hand-made semiconductor dosimeter for mammography

Assessment of MCNPX Monte Carlo Code for Absorbed Dose Calculations in Mammogarphy Examination

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