International Journal of Medical and Health Research

Authors
Dr. Sudha Rani, Dr. Katta Charu Goutham

Abstract
Aim: The purpose of the study is to determine the advantage of three dimensional volume imaging over conventional two dimensional orthogonal imaging. Materials and methods: For the study, 16 patients were selected for each of brain, head and neck, thorax, abdomen and pelvis sites. For all patients 2-D kilovoltage (kV) orthogonal images and 3-D volumetric cone beam images (CBCT) were acquired as a part of setup verification. The set up correction shift applied in all three coordinates for both the imaging techniques were noted down. Results: The cumulative mean couch applied shifts for all the patients for CBCT imaging modality was 3.1 mm in lateral, 3.3 mm in vertical and 4.2 mm in longitudinal direction. The cumulative mean couch applied shifts for all patients for kV imaging modality was 2.5 mm in lateral, 2.7 mm in vertical and 3.2 mm in longitudinal direction. Conclusion: From the study, we found that CBCT imaging was superior to orthogonal 2-D imaging for all sites, although CBCT imaging took longer duration. 2-D imaging is fast and widely used but only bony matching can be done. The main advantage of CBCT is 3-D volume informations.