Additional factors for the estimation of mean glandular breast dose using the UK mammography dosimetry protocol

Dance, David R.; Skinner, C L; Young, Kenneth C.; Beckett, Jeremy; Kotre, C J

doi:10.1088/0031-9155/45/11/308

Cited by 561 publications

(664 citation statements)

References 17 publications

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“…Maybe for thinner breasts the layer of skin and adipose tissue is smaller than that for thicker breasts. Values of glandularity exceeding 1 are also observed in other studies at small breast thicknesses (Klein et al 1997, Dance et al 2000. For all breasts, 2.5% of the glandularities are in excess of 1.…”

Section: Resultssupporting

confidence: 82%

“…In addition, the tests according to Press et al (1987) of the skewness of the distributions of the compressed breast thickness and of the mean glandular dose as shown in figures 3 45-49 years participated compared to that in the other centres (figure 2) and a relatively large number of women with thinner compressed breasts were observed ( figure 3). An increasing glandularity with decreasing age has usually been observed (Klein et al 1997, Dance et al 2000, as well as an increasing glandularity with decreasing breast thickness (Zoetelief et al 1989). The relatively low value for the average glandularity in Heerenveen might be attributed to the relatively larger number of women with larger compressed breast thickness (figure 3) and the relatively higher ages (figure 2) of the participating women compared to the other centres.…”

Section: Resultsmentioning

confidence: 98%

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Glandularity and mean glandular dose determined for individual women at four regional breast cancer screening units in The Netherlands

et al. 2006

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The nationwide breast cancer screening programme using mammography has been in full operation in The Netherlands since 1997. There is concern that the mean glandular doses due to mammography might be differing between different regions of the country due to differences in glandularity and compressed breast thickness. To investigate regional differences, glandularity, compressed breast thickness and mean glandular dose were determined for individual breasts during screening at mammography units at four locations in The Netherlands. Differences in glandularity were observed, which could be related qualitatively to differences in age of the participants at the different locations. Mean glandular dose depends on compressed breast thickness, glandularity and technical conditions of screening. The lowest average value of the mean glandular dose was found for the unit in Amsterdam. This is most likely due to the use of the Mo/Rh anode/filter combination at this unit, in addition to the Mo/Mo combination. At the other three units, almost exclusively the Mo/Mo anode/filter combination was used. Differences in mean glandular dose averaged per unit could be related mainly to differences in tube-current exposure-time product values. Consequently, it is concluded that differences in mean glandular dose at different units are marginal.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 98%

Glandularity and mean glandular dose determined for individual women at four regional breast cancer screening units in The Netherlands

et al. 2006

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“…Scatter was calculated using Monte Carlo simulations for a 6 cm thick breast and added to the images. The spectra used were scaled so that the mean glandular dose [11,12] to the breast was in all cases 2.5 mGy [13]. The ray tracing simulation included the effect of the grid transmission factor, tube half value layer, geometric blurring due to the focal spot finite size, tube movement blurring of the focal spot, attenuation in the breast support and compression paddle, as appropriate to the three imaging modalities.…”

Section: Image Simulationmentioning

confidence: 99%

Detection of microcalcification clusters by 2D-mammography and narrow and wide angle digital breast tomosynthesis

et al. 2016

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The aim of this study was to compare the detection of microcalcification clusters by human observers in breast images using 2D-mammography and narrow (15°/15 projections) and wide (50°/25 projections) angle digital breast tomosynthesis (DBT). Simulated microcalcification clusters with a range of microcalcification diameters (125 μm-275 μm) were inserted into 6 cm thick simulated compressed breasts. Breast images were produced with and without inserted microcalcification clusters using a set of image modelling tools, which were developed to represent clinical imaging by mammography and tomosynthesis. Commercially available software was used for image processing and image reconstruction. The images were then used in a series of 4-alternative forced choice (4AFC) human observer experiments conducted for signal detection with the microcalcification clusters as targets. The minimum detectable calcification diameter was found for each imaging modality: (i) 2D-mammography: 164±5 μm (ii) narrow angle DBT: 210±5 μm, (iii) wide angle DBT: 255±4 μm. A statistically significant difference was found between the minimum detectable calcification diameters that can be detected by the three imaging modalities. Furthermore, it was found that there was not a statistically significant difference between the results of the five observers that participated in this study. In conclusion, this study presents a method that quantifies the threshold diameter required for microcalcification detection, using high resolution, realistic images with observers, for the comparison of DBT geometries with 2D-mammography. 2D-mammography can visualise smaller detail diameter than both DBT imaging modalities and narrow-angle DBT can visualise a smaller detail diameter than wide-angle DBT.

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“…The AGD is a product of the incident air kerma and a conversion factor, g (6) . Measurement of the air kerma requires an appropriate calibration coefficient.…”

Section: Introductionmentioning

confidence: 99%

Calibration coefficients of dosimeters used in mammography for various target/filter combinations

Sekimoto¹,

Katoh

2015

J Applied Clin Med Phys

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A wide variety of existing combinations of target and filter materials (target/filter combinations) are used in mammography equipment. The patient dose depends on the X‐ray quality that is derived from the target/filter combination, and a calibration of the dosimeter that is used in the measurement that corresponds to the specific target/filter combination is necessary. However, dosimeters in mammography are generally calibrated with reference to the X‐ray quality of Mo/Mo or W/Al combinations, and it is unclear whether or not the X‐ray quality that is derived from other target/filter combinations will affect the calibration coefficients. In this paper, the calibration coefficients of different dosimeters were evaluated for target/filter combinations. For an ionization chamber‐type dosimeter, good energy dependence was found and the effect of the target/filter combination was small. However, for a semiconductor dosimeter, a large energy dependence was found, and different calibration coefficients that depended on the target/filter combination used were required.PACS number: 87.59.E‐

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Additional factors for the estimation of mean glandular breast dose using the UK mammography dosimetry protocol

Cited by 561 publications

References 17 publications

Glandularity and mean glandular dose determined for individual women at four regional breast cancer screening units in The Netherlands

Glandularity and mean glandular dose determined for individual women at four regional breast cancer screening units in The Netherlands

Detection of microcalcification clusters by 2D-mammography and narrow and wide angle digital breast tomosynthesis

Calibration coefficients of dosimeters used in mammography for various target/filter combinations

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