医学
肿块切除术
放射科
核医学
活检
放射治疗计划
断层摄影术
放射治疗
乳腺癌
乳房切除术
癌症
内科学
作者
Melanie C. Smitt,Robyn L. Birdwell,Don R. Goffinet
出处
期刊:Radiology
[Radiological Society of North America]
日期:2001-04-01
卷期号:219 (1): 203-206
被引量:75
标识
DOI:10.1148/radiology.219.1.r01ap34203
摘要
PURPOSE: To compare computed tomography (CT) with ultrasonography (US) for depiction of the biopsy cavity. MATERIALS AND METHODS: Thirty-two consecutive patients who underwent radiation therapy following lumpectomy with a planned electron boost were examined. At the time of simulation for whole-breast radiation therapy, all patients underwent planning CT (CT 1) at 3-mm section intervals. At the time of electron boost simulation, US was performed to define the biopsy cavity. In 17 cases, a second CT examination (CT 2) was performed at the time of electron boost simulation. CT and US studies were reviewed jointly and assigned a cavity visualization score (CVS) of 1 (cavity not visualized) to 5 (all cavity margins clearly defined). RESULTS: The median CVS at CT 1 was 5; at CT 2, 4; and at US, 4. For patients who underwent all three studies, the median CVS at CT 1 was 5; at CT 2, 4; and at US, 4. Factors related to CVS at CT 1 were homogeneous versus heterogeneous appearance (score, 5 vs 4), surgery-to-CT interval (≤30 days, 5; 31–60 days, 4; >60 days, 4), and cavity size (>15 cm3, 5; <15 cm3, 4). In all cases, cavity volume decreased somewhat during the CT 1–to–CT 2 interval. CONCLUSION: CT performed at the time of whole-breast simulation can be used to plan electron boost fields, with cavity visualization similar to that at US.
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