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A study of mean glandular dose during diagnostic mammography in Malaysia and some of the factors affecting it

¹ Malaysian Institute for Nuclear Technology Research (MINT), 43000 Kajang, Selangor, Malaysia, ² Department of Radiology, University of Malaya Medical Centre, 59100 Kuala Lumpur, Malaysia and ³ School of Medical Radiation Sciences, University of Sydney, Lidcombe NSW, 1825 Australia

View larger version (11K): [in a new window]   Figure 1. Distribution of standard breast mean glandular dose (MGD) for 30 mammography units surveyed.

View larger version (9K): [in a new window]   Figure 2. Standard breast mean glandular dose (MGD) against standard optical density (OD) for 30 mammography units surveyed.

View larger version (28K): [in a new window]   Figure 3. Age distribution of the study sample according to ethnic groups.

View larger version (12K): [in a new window]   Figure 4. Histogram showing the percentage of films as a function of the mean glandular dose (MGD) per film for craniocaudal (CC) and mediolateral oblique (MLO). Axis labels represent the upper bound of alternate 0.2 mGy bands.

View larger version (12K): [in a new window]   Figure 5. Histogram showing the percentage of films as a function of compressed breast thickness (CBT) for craniocaudal (CC) and mediolateral oblique (MLO) views. Axis labels represent the mid-point of 5 mm bands.

View larger version (9K): [in a new window]   Figure 6. Box-whisker plot of mean glandular dose (MGD) per woman for different ethnic groups; Malay (n=100), Chinese (n=100), and Indian (n=100). The 25th and 75th percentile marks the box and whiskers extend to the range outliers excluded. The median is marked in the box. The median, which is not central, represents the study population, which is not normally distributed. The open circles (o) are outliers that represent cases that have values of more than 1.5 box-lengths from the 75th percentile. The asterisks (*) are extreme values that represent cases that have values of more that three box-lengths from the 75th percentile.

View larger version (10K): [in a new window]   Figure 7. Box-whisker plot showing variations of mean glandular dose (MGD) per woman with BMI between 21 and 35.

View larger version (11K): [in a new window]   Figure 8. Box-whisker plot showing variations of mean glandular dose (MGD) per woman age 45 years to 69 years.