3-D Conformal Volumetric Alignment of Savi<sup>®</sup> Applicator Using Cone Beam Imaging Technique

Research Article

Austin J Radiat Oncol & Cancer. 2016; 2(2): 1021.

3-D Conformal Volumetric Alignment of Savi® Applicator Using Cone Beam Imaging Technique

Bhatnagar R¹*, James R¹, Simmons D¹, Berlin D², Brinkman J², Paryani S³, Paryani N³, Bhatnagar N4 and Kuruvilla A3

¹21st Century Oncology-Orange Park Cancer Center, USA

²North Florida Surgeons, Orange Park, Florida, USA

³First Radiation &Oncology Group, Jacksonville, Florida, USA

4University of Tennessee College of Medicine, Memphis, Tennessee, USA

*Corresponding author: Ravi Bhatnagar, 21st Century Oncology-Orange Park Cancer Center, 2161 Kingsley, Avenue, Orange Park, FL 32073, USA

Received: August 18, 2016; Accepted: September 21, 2016; Published: September 23, 2016


We report a novel technique to confirm volumetric alignment of the SAVI® (Strut-Adjusted Volume Implant) applicator by utilizing fiducial markers embedded within the struts of the applicator. The technique compares Treatment Planning Cone Beam Images with daily, pre-treatment Cone Beam CT (CBCT) images obtained using the imaging option on a linear accelerator. The accelerator vault is also used for delivering High Dose Rate radiation treatment using Ir-192 source in a Nucletron after-loader immediately following matching of CBCT images. This allows for rapid verification of the correct position of SAVI Catheters without having to move patient when delivering HDR therapy.

Keywords: Cone beam CT, 3-D Conformal volumetric alignment, Savi®


The SAVI technique for APBI (Accelerate Partial Breast Irradiation) offers some clinical and dosimetric advantages [1] over other devices currently on the market. The SAVI applicator consists of one (1) central catheter surrounded by as many as ten (10) collapsible peripheral catheters listed in Table 1. The fully expanded applicator is ellipsoid in shape and treatment volumes ranging from 20cc to 60cc can be treated effectively by selecting appropriate SAVI device. The catheter material is a fluoropolymer, which is biocompatible, highly inert, and lubricated making it resistant to adherence to tissue.