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Technical Note: Feasibility study of titanium markers in choroidal melanoma localization for proton beam radiation therapy
Author(s) -
Daftari Inder K.,
Quivey Jeanne M.,
Chang Jennifer S.,
Mishra Kavita K.
Publication year - 2018
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1002/mp.12764
Subject(s) - fiducial marker , imaging phantom , artifact (error) , nuclear medicine , titanium , choroidal melanoma , scanner , medicine , optics , materials science , radiology , physics , computer science , melanoma , artificial intelligence , metallurgy , cancer research
Purpose The purpose of this study is to explore the feasibility of the use of titanium fiducial markers to minimize the metallic artifact seen with tantalum markers which causes significant distortion on postoperative orbital CT scans. Method We designed and constructed the titanium markers in the shop of Crocker Nuclear Laboratory, UC Davis, CA. The markers were placed on an eyeball phantom. The eyeball was inserted into the Rando phantom in the orbital space. The Rando phantom was imaged with coplanar x rays on Nucletron simulator at UCSF , on digital panel on the eye beam line at CNL eye treatment facility and on CT scanner at UCSF . Results The titanium markers can be clearly seen on the hard copy of x rays and on digital panel. The CT scan of an orbit using tantalum markers on the right eye and titanium markers on the left eye shows the metal artifact from tantalum markers. Titanium markers show very little distortion on CT images. Conclusion The present study describes these markers and their relative benefit in comparison with tantalum marker, which has been used for localizing ocular tumor for decades.