Advanced Small Animal Conformal Radiation Therapy Device

Area of Science:

• Medical Physics
• Radiation Oncology
• Preclinical Imaging

Background:

• Accurate radiation delivery and imaging are crucial for preclinical cancer research.
• Existing commercial systems may not meet all academic laboratory needs for targeted small animal irradiations.

Purpose of the Study:

• To describe the development and capabilities of a novel small animal conformal radiation therapy (SA-CRT) device.
• To review the shielding, dosimetric measurements, and applications of the SA-CRT system.
• To present preliminary data on the therapeutic efficacy of spatially fractionated radiation in a breast cancer model.

Main Methods:

• The SA-CRT device integrates an X-ray tube, robotic positioning, and digital imaging within a shielded enclosure.
• Radiation delivery is precisely controlled with a custom gantry and collimator system (0.5 mm–20 cm field size).
• 3D imaging for target localization is achieved using the X-ray source and in-house reconstruction software.

Main Results:

• The SA-CRT system provides precise and accurate conformal radiation delivery and imaging for small animals.
• Shielding and calibration adhere to established guidelines (NCRP 49, AAPM TG-61).
• Initial studies demonstrate the system's utility, including in vivo evaluation of spatially fractionated radiation in a rat breast cancer model.

Conclusions:

• The developed SA-CRT device is a versatile, integrated system for translational radiation oncology research in academic settings.
• The system facilitates precise targeting, imaging, and dose delivery, comparable to commercial irradiators.
• Further research utilizing this platform can advance understanding of radiation therapy efficacy and novel treatment combinations.