Radiotherapy planning for simulation of prostate cancer: computerized tomographic scanning vs. conventional...

Area of Science:

• Radiation Oncology
• Medical Imaging
• Urologic Oncology

Background:

• Accurate tumor delineation is critical for effective prostate cancer radiotherapy.
• Conventional simulation methods using orthogonal radiography and contrast media have limitations in defining tumor extent.
• Minimizing invasiveness in localization procedures enhances patient comfort and safety.

Purpose of the Study:

• To describe and evaluate a novel computerized tomographic (CT) localization protocol for prostate cancer treatment planning.
• To compare the efficacy of CT localization with conventional radiographic simulation.
• To assess the ability of CT to accurately delineate tumor margins and avoid invasive manipulations.

Main Methods:

• A computerized tomographic (CT) localization protocol was developed and implemented.
• The CT protocol was compared against conventional orthogonal radiographic simulation in 23 prostate cancer patients.
• Contrast media were used in the rectum, bladder, and urethra for conventional simulation.

Main Results:

• CT localization demonstrated enhanced delineation of tumor extension in superior, lateral, anterior, and posterior directions.
• Accurate localization of the inferior target volume border was feasible using CT.
• The CT protocol successfully avoided the need for invasive urethral, bladder, and rectal manipulations.

Conclusions:

• Computerized tomographic localization offers superior accuracy in defining prostate cancer tumor extent compared to conventional methods.
• CT-based localization enhances treatment planning precision while improving patient experience by eliminating invasive procedures.
• This CT protocol represents a significant advancement in prostate cancer radiotherapy planning.