What is IMRT QA?

What is IMRT QA?

Patient-specific intensity-modulated radiotherapy (IMRT) quality assurance (QA) is critically important to the successful implementation of IMRT. It ensures correct machine-sided delivery of the prescribed dose by checking the accuracy of dose calculation, plan transfer, and treatment delivery.

What is the difference between IMRT and SBRT?

Compared with the more standard intensity-modulated radiation therapy (IMRT), SBRT is technologically more intensive2,3 and delivers higher doses of radiation per treatment, with an entire course of treatment delivered in up to five visits.

Which is better SBRT or IMRT?

Stereotactic body radiation therapy (SBRT) is a technically demanding prostate cancer treatment that may be less expensive than intensity-modulated radiation therapy (IMRT). Because SBRT may deliver a greater biologic dose of radiation than IMRT, toxicity could be increased.

What is the difference between stereotactic radiosurgery and stereotactic radiotherapy?

SRT delivers radiation therapy in smaller amounts over several treatment sessions. Both SRS and SRT deliver similar total doses of radiation, but SRT allows the healthy tissues time to recover between treatment sessions.

What is patient QA?

A patient-specific quality assurance (QA) test is conducted to verify the accuracy of dose delivery. It generally consists of three verification processes: the absolute point dose difference, the planar dose differences at each gantry angle, and the planar dose differences by 3D composite irradiation.

What is patient specific quality assurance?

A patient specific quality assurance program has been developed to facilitate the clinical implementation of intensity modulated radiotherapy (IMRT) delivered using a micro-multileaf collimator. The methodology includes several dosimetric tasks that are performed prior to the treatment of each patient.

What are the disadvantages of IMRT?

The biggest defect associated with IMRT is increase in total body irradiation. IMRT saves OARs from receiving high radiation dose but at the same time delivers lower dose to the less critical organs. This technique spread out the delivered dose to the whole body and increases the total body exposure.

Is IMRT Stereotactic?

The presented possibilities of stereotactic IMRT in the treatment of MPM will justify the evaluation of IMRT in early-stage pleural mesothelioma combined with chemotherapy in a study protocol, in order to improve the outcome of these patients. Furthermore, dose escalation should be possible by using IMRT.

What is the success rate of stereotactic radiosurgery?

SBRT has shown dramatically better outcomes than conventional radiation therapy. Whereas two-year success rates for conventional treatment range from 30 to 40 percent, the success rates for SBRT range from 80 to 90 percent — comparable to those of resection surgery but with far fewer risks.

What are the side effects of stereotactic radiotherapy?

What are the side effects of stereotactic radiosurgery?

• fatigue.
• nausea.
• headache.
• bleeding.
• pain and infection at the pin-sites of the head frame.
• vertigo.

What is the primary purpose of patient specific IMRT QA measurements?

They provide important information about overall distribution in a particular plane. In addition, ion chamber verification provides information about absolute agreement at a point. The protocol developed for IMRT patient treatment verification is as follows.

What is Gamma evaluation?

Abstract. The gamma-evaluation method is a tool by which dose distributions can be compared in a quantitative manner combining dose-difference and distance-to-agreement criteria.