CAJ | 학술논문

目的：探讨数字乳腺断层摄影（ DBT）下不同乳腺分型、不同乳腺厚度与腺体剂量之间的关系，并比较DBT与全视野数字乳腺X线摄影（ FFDM）的腺体剂量。方法对520例患者在同一压迫状态下，先进行DBT，再进行FFDM，选用自动曝光模式进行曝光。比较相同厚度水平下，DBT下4种不同乳腺分型的腺体剂量，以及比较同一压迫状态下DBT与FFDM的腺体剂量。结果520例中脂肪型4例，少量腺体型96例，多量腺体型308例，致密型112例；在同一乳腺厚度FFDM及DBT均以致密型乳腺的腺体剂量最高，多量腺体次之，少量腺体型及脂肪型最少。同一压迫状态下FFDM腺体剂量（1.50±0.40）mGy，DBT腺体剂量（1.66±0.24）mGy，差异有统计学意义（P＜0.01）。结论 DBT与FFDM的腺体剂量均随着乳腺厚度及密度的增加而升高，同一压迫状态下DBT腺体剂量大于FFDM。
목적：탐토수자유선단층섭영（ DBT）하불동유선분형、불동유선후도여선체제량지간적관계，병비교DBT여전시야수자유선X선섭영（ FFDM）적선체제량。방법대520례환자재동일압박상태하，선진행DBT，재진행FFDM，선용자동폭광모식진행폭광。비교상동후도수평하，DBT하4충불동유선분형적선체제량，이급비교동일압박상태하DBT여FFDM적선체제량。결과520례중지방형4례，소량선체형96례，다량선체형308례，치밀형112례；재동일유선후도FFDM급DBT균이치밀형유선적선체제량최고，다량선체차지，소량선체형급지방형최소。동일압박상태하FFDM선체제량（1.50±0.40）mGy，DBT선체제량（1.66±0.24）mGy，차이유통계학의의（P＜0.01）。결론 DBT여FFDM적선체제량균수착유선후도급밀도적증가이승고，동일압박상태하DBT선체제량대우FFDM。
Objective To investigate the correlation of average glandular dose ( AGD) with categories of breast composition and breast compressed thickness in digital breast tomosynthesis ( DBT) , and to compare the average glandular dose between DBT and FFDM .Methods 520 patients received a serial scan of DBT before FFDM under the same pres-sure condition with AEC mode .AGD during DBT was compared among 4 categories of breast composition within the same breast compressed thickness .AGD during DBT and FFDM was also compared under the same pressure condition .Results Of 520 cases, 4 cases were of the fatty type , 96 cases were of the fibroglandular density type , 308 cases were of the het-erogeneously dense type , and 112 cases were of the extremely dense type .With the same thickness , the AGD is highest in the extremely dense type and lowest in the fatty type , during both FFDM and DBT .Under the same pressure condition , AGD was (1.50 ±0.40) mGy in FFDM and (1.66 ±0.24) mGy in DBT (P<0.01).Conclusion AGD rises with breast compression thickness and density in both FFDM and DBT .In the same compression status , AGD of DBT is higher than FFDM.