Use of a CT simulator in radiotherapy treatment planning for breast conserving therapy.
A CT simulator (CT-S) is a real-time, CT-linked, 3-D treatment planning system, which consists of a CT scanner, a multi-image display, a treatment planning device with real-time visual optimization, and a laser beam projector. This system was clinically evaluated in 339 Stage 0, I and II breast cancers in 337 patients who received breast conserving therapy. Following quadrantectomy or wide excision with complete axillary dissection, a total of 50 Gy was delivered to the ipsilateral breast using 60Co gamma-rays. In patients with involved surgical margins, boost electron irradiation was also given. Treatment planning could be accomplished within 40-50 min using the CT-S. The parameters for the tangential portals could be optimized for each patient, and the wedge filters and the electron energy for boost irradiation could be appropriately selected. The incidence of moist desquamation and depigmentation at the areola was slightly decreased with the use of wedge filters. During the follow-up for 2-71 months (median, 22 months), local recurrence and symptomatic radiation pneumonitis occurred in one patient each. The CT-S appears to be useful for the individualized optimization of tangential irradiation fields in breast conserving therapy.
Hiraoka
M
M
Department of Radiology, Faculty of Medicine, Kyoto University, Japan.
Mitsumori
M
M
Okajima
K
K
Nagata
Y
Y
Takahashi
M
M
Nakata
M
M
Abe
M
M
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001940:Breast / Q000473:pathology / Q000528:radiation effects; D001943:Breast Neoplasms / Q000000981:diagnostic imaging / Q000532:radiotherapy* / Q000601:surgery; D018270:Carcinoma, Ductal, Breast / Q000000981:diagnostic imaging / Q000532:radiotherapy / Q000601:surgery; D003037:Cobalt Radioisotopes / Q000627:therapeutic use; D003131:Combined Modality Therapy; D003198:Computer Simulation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007834:Lasers; D008197:Lymph Node Excision; D015412:Mastectomy, Segmental; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D011014:Pneumonia / Q000209:etiology; D011832:Radiation Injuries / Q000209:etiology; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D011882:Radiotherapy, High-Energy; D013997:Time Factors; D014057:Tomography, X-Ray Computed
D003037:Cobalt Radioisotopes