Analysis of Variation of Tin Filter on Noise Values in CT Scan Mastoid Protocol Using CT Scan Single Source: Phantom Study

Since its introduction in 1972, CT Scan technology has developed rapidly from year to year, especially in reducing radiation dose; various technologies have been developed, including dual-energy or dual source technology with a technique of only a quarter of the gantry rotation. The aim of this research is to find out and analyze tin filter variations on noise in the mastoid CT scan protocol using a single source CT scan: phantom study. The method used in this research is Pre-Experimental with Posttest-Only Control Design. The noise value research results showed a difference in noise and SNR values with a p-value (p<0.05), and there was a reduction in radiation dose of 41.95% compared to the standard protocol. NPS values are at a frequency of 0.28, except for the Sn100 protocol. Subjective Analysis by two radiologists with a kappa value of 0.75 indicated that there was a moderate level of agreement. The Tin Filter Sn100 protocol can reduce the radiation dose, and the resulting image quality is good enough for diagnostic purposes, so the Tin Filter Sn100 protocol can be used as a Standard Operational Procedure for Mastoid CT Scan examination at Hermina Depok Hospital. This study has implications that may contribute to refining mastoid CT scanning protocols, leading to improved image quality, reduced radiation exposure, and improved diagnostic capabilities in clinical practice.