Estimation of mean-glandular dose from monitoring breast entrance skin air kerma using a high sensitivity metal oxide semiconductor field effect transistor (MOSFET) dosimeter system in mammography

Dong, Shang-Lung; Chu, T. L.; Lee, J.S; Lan, Gong Yau; Wu, T.H; Yeh, Yu Hsiu; Hwang, Jeng Jong

doi:10.1016/s0969-8043(02)00172-0

Cited by 20 publications

(11 citation statements)

References 18 publications

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“…Some investigators, however, have proposed that the incident air kerma could be measured in real time or in vivo with dosimeters placed in the field of view during each breast image acquisition. For this measurement, there have been studies using dosimeters based on metal oxide semiconductor field effect transistors (MOSFET) (Dong et al , 2002; Benevides and Hintenlang, 2006; Cavagnetto et al , 2013), thermoluminescence (TLD) (Bastos et al , 2011), radioluminescence (RL) (Benevides et al , 2007), and both RL and optically stimulated luminescence (OSL) (Aznar et al , 2005). In general, these studies have shown that the use of these different technologies is feasible for the measurement of air kerma during each acquisition, reaching, in most cases, a good level of agreement with ion chamber dosimeter measurements.…”

Section: Alternative Methods Of Dose Measurementmentioning

confidence: 99%

Dosimetry in x-ray-based breast imaging

2016

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The estimation of the mean glandular dose to the breast (MGD) for x-ray based imaging modalities forms an essential part of quality control and is needed for risk estimation and for system design and optimisation. This review considers the development of methods for estimating the MGD for mammography, digital breast tomosynthesis (DBT) and dedicated breast CT (DBCT). Almost all of the methodology used employs Monte Carlo calculated conversion factors to relate the measurable quantity, generally the incident air kerma, to the MGD. After a review of the size and composition of the female breast, the various mathematical models used are discussed, with particular emphasis on models for mammography. These range from simple geometrical shapes, to the more recent complex models based on patient DBCT examinations. The possibility of patient-specific dose estimates is considered as well as special diagnostic views and the effect of breast implants. Calculations using the complex models show that the MGD for mammography is overestimated by about 30% when the simple models are used. The design and uses of breast-simulating test phantoms for measuring incident air kerma are outlined and comparisons made between patient and phantom-based dose estimates. The most widely used national and international dosimetry protocols for mammography are based on different simple geometrical models of the breast, and harmonisation of these protocols using more complex breast models is desirable.

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Section: Alternative Methods Of Dose Measurementmentioning

confidence: 99%

Dosimetry in x-ray-based breast imaging

2016

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“…Furthermore, the model breast for average glandular dose assessment has to take into account only the portion of the compressed breast inside the mammographic imaging field. Some studies [15,16] have reported that the average compressed breast thickness of Asian women is thinner than that of Western women. At present, few attempts have been made to develop a model breast for Asian women.…”

Section: Development Of An Adjustable Model Breast For Mammographic Dmentioning

confidence: 99%

Development of an Adjustable Model Breast for Mammographic Dosimetry Assessment in Taiwanese Women

Dong

Chu

Lan

et al. 2011

American Journal of Roentgenology

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“…A number of investigators have sought to develop sophisticated techniques for physically measuring radiation dose to breast-mimicking phantoms. These efforts led to the use of diamond dosimeters, 98 thimble chambers, 99,100 photodiode dosimeters, 101 thermal luminescent dosimetry systems, 102 as well as metal oxide semiconductor field effect transistors 103 for breast dosimetry. Always a challenge when air is not used as the absorbing medium, the use of solid state detector systems usually require a thorough understanding of and correction for the x-ray energy dependence of the chamber.…”

Section: Ivb Modern Mammography Dosimetrymentioning

confidence: 99%

Overview of patient dosimetry in diagnostic radiology in the USA for the past

2008

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This review covers the role of medical physics in addressing issues directly related to patient dosimetry in radiography, fluoroscopy, mammography, and CT. The sections on radiography and fluoroscopy radiation doses review the changes that have occurred during the last 50 to 60 years. A number of technological improvements have contributed to both a significant reduction in patient and staff radiation doses and improvements to the image quality during this period of time. There has been a transition from film-screen radiography with hand dip film processing to electronic digital imaging utilizing CR and DR. Similarly, fluoroscopy has progressed by directly viewing image intensifiers in darkened rooms to modern flat panel image receptor systems utilizing pulsed radiation, automated variable filtration, and digitally processed images. Mammography is one of the most highly optimized imaging procedures performed, because it is a repetitive screening procedure that results in annual radiation exposure. Mammography is also the only imaging procedure in the United States in which the radiation dose is regulated by the federal government. Consequently, many medical physicists have studied the dosimetry associated with screen-film and digital mammography. In this review, a brief history of mammography dose assessment by medical physicists is discussed. CT was introduced into clinical practice in the early 1970s, and has grown into one of the most important modalities available for diagnostic imaging. CT dose quantities and measurement techniques are described, and values of radiation dose for different types of scanner are presented. Organ and effective doses to adult patients are surveyed from the earliest single slice scanners, to the latest versions that include up to two x-ray tubes and can incorporate as many as 256 detector channels. An overview is provided of doses received by pediatric patients undergoing CT examinations, as well as methods, and results, of studies performed to assess the radiation absorbed by the conceptus of pregnant patients.

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Estimation of mean-glandular dose from monitoring breast entrance skin air kerma using a high sensitivity metal oxide semiconductor field effect transistor (MOSFET) dosimeter system in mammography

Cited by 20 publications

References 18 publications

Dosimetry in x-ray-based breast imaging

Dosimetry in x-ray-based breast imaging

Development of an Adjustable Model Breast for Mammographic Dosimetry Assessment in Taiwanese Women

Overview of patient dosimetry in diagnostic radiology in the USA for the past

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