Related Experiment Videos
Gynecologic radiotherapy fields defined by intraoperative measurements.
B E Greer1, W J Koh, D C Figge
1Department of Obstetrics and Gynecology, University of Washington Medical Center, Seattle 98195.
Gynecologic Oncology
|September 1, 1990
Summary
Conventional whole-pelvis radiation therapy fields often miss anatomic landmarks. Intraoperative measurements suggest adjusting field dimensions for optimal lymphatic coverage in radiotherapy, especially for cervical cancers.
Area of Science:
- Oncology
- Radiation Oncology
- Surgical Anatomy
Background:
- Whole-pelvis radiation therapy (WPRT) traditionally uses conventional field dimensions based on textbook anatomy.
- These conventional methods may not accurately reflect individual patient anatomy, potentially affecting treatment efficacy.
Purpose of the Study:
- To examine the anatomic basis for conventional radiation therapy field dimensions.
- To correlate intraoperative measurements with lymphatic pathways for improved radiotherapy planning.
Main Methods:
- Intraoperative retroperitoneal measurements were performed on 100 patients undergoing radical surgery.
- Pelvic and paraaortic arterial branches were measured relative to the lumbosacral prominence.
- Transverse pelvic dimensions and femoral artery separation were recorded.
Main Results:
- Aortic bifurcation averaged 6.7 cm above the lumbosacral prominence; common iliac bifurcations were above this level in 87% of patients.
- Pelvic width measured 12.3-13.0 cm; maximal femoral artery separation averaged 14.6 cm.
- Conventional fields may not align with actual anatomic landmarks.
Conclusions:
- Intraoperative measurements are crucial for optimizing radiotherapy field dimensions to cover lymphatic pathways.
- For cervical cancer WPRT, suggest anterior/posterior fields of at least 16 cm width and a superior border at L4-L5 interspace.
- Lateral fields should encompass the anterior sacral silhouette, considering ligamentous attachments.