A Aljabal*, P Lin, M Ghita, Virginia Commonwealth University, Richmond, VA

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  A Aljabal

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PO-GePV-I-93 (Sunday, 7/10/2022)   [Eastern Time (GMT-4)]

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Purpose: This study aims to characterize the RTI’s R-100 Modified solid-state detector (R-100M) by performing air kerma measurements using an ion chamber as the gold standard, a production model R-100 probe, and the modified solid-state detector R-100M (protective tungsten foil on the backside of the detector housing removed) for the diagnostic energy range employed for radiography and fluoroscopy. The air kerma dose, dose rate, influence of backscatter, and half-value layer (HVL) measurements are employed to characterize the R-100M.

Methods: A series of air kerma measurements were performed with an ionization chamber, an R-100, and a modified solid-state detector (R-100M) for the common clinical techniques. HVL values were measured using three sensors systems individually, solid-state detectors R-100, R-100M probes, and an ionization chamber with various tube potentials 60 through 120 kVp in increments of 20 kVp and in combination with spectral shaping filters of 0.1, 0.2, 0.3, 0.6, and 0.9 mmCu. The R-100M probe’s measurements were validated using ion chamber measurements as a reference and compared with the production model R-100 measurements. The experimental setup and test method for air-kerma and HVL measurements were performed under the narrow beam geometry (NBG) following ASTM Designation F3094-14 standards. All measurements are performed using an interventional angiography unit (GE Innova IGS 520) under the service mode to adjust radiological parameters manually.

Results: Testing is still ongoing, and final results will be presented.

Conclusion: With the tungsten backing foil removed, in-depth information of R100M showed it behaved similarly to an ionization chamber.

Keywords

Radiation Detectors, Radiography, Radiation Dosimetry

Taxonomy

IM- X-Ray: Detector development & evaluation

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