ESTRO 2023 - Abstract Book

S749

Monday 15 May 2023

ESTRO 2023

Conclusion We have developed a framework to identify key features in single-lead smartwatch ECGs. We have validated on multiple ECG databases and found accuracies comparable to the literature. Preliminary analysis on 10 patients with lung cancer showed feasibility for long-term monitoring, with the framework identifying potential abnormalities in cardiac function.

PD-0902 ACR Accreditation Evaluation of a Novel High Speed Ring-Gantry Linac kV CBCT System A. Haertter 1 , M. Salerno 1 , B. Koger 1 , C. Kennedy 1 , B.K. Teo 1 , M. Alonso-Basanta 1 , L. Dong 1 , T. Li 1 1 University of Pennsylvania, Department of Radiation Oncology, Philadelphia, USA

Purpose or Objective The newly introduced Varian HyperSight™ imaging system features improved imaging hardware, reconstruction algorithm, and imaging speed. To assess the feasibility of using HyperSight CBCT for treatment planning and target/organ delineation, we evaluated its imaging performance using American College of Radiology (ACR) Program accreditation tests for diagnostic CTs, and compared it with existing CBCT systems such as a Varian TrueBeam™, Varian Halcyon™ version 2.0, and a diagnostic CT scanner (Siemens Somatom Edge). Materials and Methods Image quality performance of several CBCT image protocols produced by the Varian HyperSight was assessed and compared to existing imaging modalities using an ACR Head CT phantom. Image quality assessments included contrast-to-noise ratio (CNR), spatial resolution, HU accuracy, and image scaling analyses. All image quality assessments were made following the recommendations and passing criteria provided by the ACR (see Figure 1).

Results The Varian HyperSight imaging system produces excellent image quality, with many imaging protocols capable of passing all ACR CT accreditation standards (see Figure 2 (a)). The Head, H&N, pediatric head, abdomen, and pelvis protocols passed all ACR criteria, and the abdomen large and pelvis large protocols are able to pass all ACR criteria except for water HU accuracy. The pediatric abdomen protocol passed all ACR criteria except CNR and spatial resolution; however, we speculate optimization of the mAs could improve the CNR to a passing level. When compared to other standard imaging modalities, both the head and pelvis imaging protocols of the HyperSight system matched the passing criteria for Somatom CT scanner and substantially surpassed those of for Halcyon 2.0 and TrueBeam systems (see Figure 2 (b)).