A feasibility study on the use of digital tomosynthesis with individually-acquired megavoltage portal images for target localization.
OBJECTIVE
To determine the feasibility of using megavoltage (MV) images and digital tomosynthesis to determine the three dimensional (3D) localization of different objects.


METHODS
Different phantom geometries were imaged using an electronic portal imaging device and digital tomosynthesis was used to reconstruct tomograms. These were compared with corresponding computed tomography (CT) images.


RESULTS
While in-plane resolution of the tomograms was comparable as that of the CT images, definite out-of-plane (depth) localization was restricted to 5 mm.


CONCLUSIONS
The results confirm that it is possible to perform 3D localization of objects by using digital tomosynthesis for volumetric reconstructions from individually-acquired MV-quality portal images.
Sarkar
V
V
Cancer Therapy and Research Center, University of Texas Health Science Center, San Antonio, TX, USA. sarkar@uthscsa.edu
Shi
C
C
Rassiah-Szegedi
P
P
Eng
T
T
Diaz
A
A
Papanikolaou
N
N
D054893:Cone-Beam Computed Tomography / Q000295:instrumentation; D005240:Feasibility Studies; D021621:Imaging, Three-Dimensional; D019047:Phantoms, Imaging; D011857:Radiographic Image Interpretation, Computer-Assisted; D011881:Radiotherapy, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D011882:Radiotherapy, High-Energy; D050397:Radiotherapy, Intensity-Modulated; D015203:Reproducibility of Results; D012984:Software