**4. Quality assurance**

Patient specific quality assurance is a method for verification of the clinical planned dose before to start the treatment. The planned dose is compared

#### **Figure 7.**

*A screenshot from Octavius 4D measurement analyzed in Verisoft. Showing the result of 3 beams SBRT delivery of lung cases. Panels (a), (b), and (c) show dose map in eclipse, Octavius calculated dose matrices and γ-distribution in transversal, sagittal and coronal plans column wise respectively having 3 beams of SBRT delivery for lung case (figure is taken from [21]).*

*Modern Radiotherapy Techniques for Breast Cancer Treatment DOI: http://dx.doi.org/10.5772/intechopen.101700*

to delivered dose. The methodology contains various dosimetric tasks that have been performed prior to the treatment of individual patient. Any dose calculation or delivery errors would be revealed. Patient specific QA has benefit to target. The underdose or overdose are harm to the patient. Patient specific QA has been done by film dosimetry, Delta4 phantom [20], Octavius 4D phantom [21], EPID, MapCHECK etc. Each device has their own advantages (**Figure 7**).
