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| Title: | A survey of average glandular dose to patients undergoing screen/film mammography–the influence of age |
| Authors: | Shao, Chia-Ho;Chuang, Keh-Shih;Yeh, Yu-Hsu;Dong, Shang-Lung |
| Contributors: | 中山醫大 |
| Keywords: | mammography;age;average glandular dose |
| Date: | 2013 |
| Issue Date: | 2017-06-27T09:36:08Z (UTC)
|
| Publisher: | Chung Shan Medical Journal |
| Abstract: | Introduction
The determination of average glandular dose
(AGD) to patients is an important study issue
in mammography[1,2]. The reduction of AGD for
patients helps to minimize their risk of radiationinduced
cancer associated with mammography.
Therefore, many studies have investigated patient
AGD under clinical circumstances using large
cohorts of patients[3-6]. Results from these studies
provide useful information for determining
appropriate strategies for dose reduction and
for developing optimized imaging technique in
mammography.
The AGD for patients is affected by many
factors, including compressed breast thickness
(CBT), breast composition, radiographic factors
used, and the mammographic X-ray unit. Since
these factors could vary substantially from
mammogram to mammogram, variation of
AGD between patients can be substantial in a
mammographic dose survey. Numerous studies
have investigated patient AGD using radiographic
factors and breast parameters. A common finding
from these studies was that patient AGD increases
with increasing CBT.
It is clear that the CBT and breast composition
are related to patient age. As age increases,
A survey of average glandular dose to patients undergoing
screen/film mammography–the influence of age
Chia-Ho Shao1
, Keh-Shih Chuang2
, Yu-Hsu Yeh3
, Shang-Lung Dong1,*
1
School of Medical Imaging and Radiological Sciences, Chung Shan Medical University, Taichung,
Taiwan
2
Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University,
Hsinchu, Taiwan
3
Department of Radiology, Cheng Hsin General Hospital, Taipei, Taiwan
The aim of this study was to investigate age-related changes in average glandular dose (AGD) for
Taiwanese women. A retrospective review of 4092 craniocaudal screen/film exposures was conducted.
Subjects’ age range was 30-79 years. The radiographic factors of each exposure were analyzed to
determine the patient AGD. The results show that age has a strong modifying effect on glandularity,
while the compressed breast thickness (CBT) and beam quality needed varied only slightly with age.
The average values of CBT, glandularity, and AGD were 4.2 cm, 54%, and 1.70 mGy, respectively.
The values of patient AGD for the age bands 55-59 and 75-79 years were factors of 0.96 and 0.70,
respectively, compared to the age band 30-34 years. In conclusion, age appears to have a small effect
on AGD for women surveyed in the age interval 30-59 years. As age differences increase, variation in
AGD increases.
Key words: mammography, age, average glandular dose
* Corresponding Author: Shang-Lung Dong
Address: No.110, Sec.1, Jianguo N. Rd., Taichung City 40201,
Taiwan, R.O.C.
TEL.: +886-4-24730022 ext. 12364
E-mail: sldong@ms46.hinet.net
29
A survey of average glandular dose to patients
the proportion of breast volume occupied by
parenchyma decreases and the amount of adipose
tissue increases. To accurately estimate AGD from
different age groups of patients, some studies have
investigated the age-related changes in patient
AGD[7-9]. Results from these studies show that
patient AGD decreases with increasing patient age.
At present, little information has been reported
on the effect of age on patient AGD in Asian
countries[10]. Results from our previous study[11]
found that the breast dimensions (CBT, compressed
breast width, and chest-wall-to-nipple distance)
and breast composition of Taiwanese women vary
with patient age (age range: 30-69 years). Since the
previously surveyed average values of CBT and
breast composition of Taiwanese women differed
from those of Western women, it is debatable
whether the age-related changes in AGD for
Asian women are comparable to those reported
in previous studies of Western women. In view of
the lack of such studies, the goal of this study was
to investigate the age-related changes in AGD for
Taiwanese women. |
| URI: | https://ir.csmu.edu.tw:8080/ir/handle/310902500/17838 |
| Relation: | Chung Shan Medical Journal 2013; 24:29-36 |
| Appears in Collections: | [醫學影像暨放射科學系暨碩士班] 期刊論文
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