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Fabrication of In-House Non Metallic Artifact Free CT Fiducial Marker

SENTHILKUMAR SHANMUGAM1*,Madurai Medical College & Govt. Rajaji Hospital, Madurai, TN, INDIA.


(Sunday, 7/29/2018) 3:00 PM - 6:00 PM

Room: Exhibit Hall

Purpose: The purpose of this study was to discuss the dosimetric evaluation of the in-house non-metallic artifact free CT fiducial and compare with the metallic CT fiducial during CT based planning.

Methods: Metallic artifacts can seriously degrade the quality of CT images, sometimes to the point of making them diagnostically unusable. Thin bright and dark streaks originating from the metal based fiducial markers. The in-house non-metallic CT fiducial materials are in the powder form which can be modifiable to versatile shape and size according to the needs. Lead based CT markers and different sets of newly fabricated non metallic fiducial markers were used to evaluate the visibility of fiducial marker, CT number and artifact. All markers were placed in a 30 × 30 X 30 cm3 sheets of solid phantom(PTW) and imaged on a GE multi slice CT scanner for quality analysis. The CT artifact of marker were analysed using a J-image software.

Results: I have found that the newly fabricated fiducial markers has the highest visibility and almost no CT artifact when compared with the commercially available fiducial markers. The metallic fiducial marker produced bright streak artifact on the CT image but non metallic markers are not producing any streak artifact. Both metallic and non metallic markers appeared similar bright spot on the CT image. Non metallic markers has the electron density of 2000 but commercially available marker has more than 9000. Our fabricated markers density has nearly equal to human bone density so, it appears as bright spot on CT without streak artifact. Newly fabricated material can be used for regular CT simulation.

Conclusion: I conclude that the in-house CT fiducial marker will be an alternative to the existing commercially available fiducial markers with almost no artifact and also cost effective.


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