3D dosimetry by optical-CT scanning

3D dosimetry by optical-CT scanning.

The need for an accurate, practical, low-cost 3D dosimetry system is becoming ever more critical as modern dose delivery techniques increase in complexity and sophistication. A recent report from the Radiological Physics Center (RPC) (1), revealed that 38% of institutions failed the head-and-neck IMRT phantom credentialing test at the first attempt. This was despite generous passing criteria (w...

High resolution gel-dosimetry by optical-CT and MR scanning.

The increased intricacy of Intensity-Modulated-Radiation-Therapy (IMRT) delivery has created the need for a high-resolution 3D-dosimetry (three-dimensional) system capable of measuring and verifying the complex delivery. Present clinical methods are inadequate being restricted to single points (e.g., ion-chambers) or to 2D planes (e.g., film), and are labor intensive. In this paper we show that...

3D verification of a prostate IMRT treatment by polymer gel-dosimetry and optical-CT scanning

Fan-beam scanning laser optical CT system for large volume 3D dosimetry

Introduction: Optical CT scanning of radiochromic gel dosimeters is a method for true 3D dosimetry, which is becoming increasingly needed as radiation therapy techniques become more advanced. Optical CT has developed from slow pencil beam laser scanners to fast cone-beam scanners using cameras. However, scattered light perturbs these broad-beam scanners, resulting in cupping artifacts and loss ...

Application of Optical CT Scanning in Three-Dimensional Radiation Dosimetry

There has been much research effort in the development of an accurate and reliable threedimensional dose verification system, prompted by the advances of technologies in radiation treatment of cancer patients. New radiotherapy techniques such as intensity modulated radiation therapy (IMRT), stereotactic radiosurgery (SRS) and high dose rate (HDR) brachytherapy are aimed at dose deliveries that ...