ABSTRACT
CONTENTS 19.1 Introduction 316 19.2 NVBB Framework and Its Components 317
19.2.1Fluence Map Calculation 318 19.2.2NVBB Ray Tracing 319 19.2.3Adaptive Full Dose Calculation 320
19.2.3.1Full Dose Calculation 321 19.2.3.2Approximate Dose Calculation 323
19.2.4NVBB Derivative Calculation 324 19.3 Results 325
19.3.1Commercial Product 326 19.4 Discussion 328
19.4.1 Complexity 328 19.4.2Applicability of the NVBB Ray Tracing in CT
Reconstruction330 19.5 Conclusion 330 References 331
The advancement of the general purpose graphic processing unit (GPU) with data parallel streaming processor evoked many innovative approaches of handling massive computation, such as in the eld of medical physics as reviewed in References 1,2. Many algorithms were redesigned to take advantage of GPU’s parallel processing power and to accommodate its relatively small memory compared with the central processing unit (CPU). is is no exception in the eld of intensity-modulated radiation therapy (IMRT). e nonvoxel-based broad-beam (NVBB) framework [3] was developed to handle IMRT optimization and proved to be eective. is chapter gives a summary review of the NVBB framework.
