Open AccessCharacterization of a new physical phantom for testing rigid and deformable image registration
Author(s) -
Wu Richard Y.,
Liu Amy Y.,
Wisdom Paul,
Zhu Xiaorong Ronald,
Frank Steven J.,
Fuller Clifton D.,
Gunn Gary Brandon,
Palmer Matthew B.,
Wages Cody A.,
Gillin Michael T.,
Yang Jinzhong
Publication year - 2019
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1002/acm2.12514
Subject(s) - imaging phantom , rotation (mathematics) , soft tissue , image registration , translation (biology) , biomedical engineering , computer science , materials science , artificial intelligence , nuclear medicine , image (mathematics) , medicine , radiology , biochemistry , chemistry , messenger rna , gene
The purpose of this study was to describe a new user‐friendly, low‐cost phantom that was developed to test the accuracy of rigid and deformable image registration ( DIR ) systems and to demonstrate the functional efficacy of the new phantom. The phantom was constructed out of acrylic and includes a variety of inserts that simulate different tissue shapes and properties. It can simulate deformations and location changes in patient anatomy by changing the rotations of both the phantom and the inserts. CT scans of this phantom were obtained and used to test the rigid and deformable registration accuracy of the Velocity software. Eight rotation and translation scenarios were used to test the rigid registration accuracy, and 11 deformation scenarios were used to test the DIR accuracy. The mean rotation accuracies in the X‐Y (axial) and X‐Z (coronal) planes were 0.50° and 0.13°, respectively. The mean translation accuracy was 1 mm in both the X and Y direction and was tested in soft tissue and bone. The DIR accuracies for soft tissue and bone were 0.93 (mean Dice similarity coefficient), 8.3 and 4.5 mm (mean Hausdouff distance), 0.95 and 0.79 mm (mean distance), and 1.13 and 1.12 (mean volume ratio) for soft tissue content ( DTE oil) and bone, respectively. The new phantom has a simple design and can be constructed at a low cost. This phantom will allow DIR systems to be effectively and efficiently verified to ensure system performance.