B Yeager*, F Mostafaei, M Gagne, J Barrett, A Al-Basheer, Augusta University, Department of Radiation Oncology, Augusta, GA

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  B Yeager

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PO-GePV-T-249 (Sunday, 7/25/2021)   [Eastern Time (GMT-4)]

Purpose: This study aims to evaluate the feasibility of obtaining TBI patient specific measurements from available technology, specifically, LiDAR, on Apple iOS hardware and software application. The off-axis distance, reference plane distance, and patient field separations were measured with different devices for various anatomical sites according to our institutions TBI policy to determine monitor units (MU) and compare the differences.

Methods: A direct comparison between standard measurement devices, caliper or measuring tape, and the Apple iPhone® iOS application was performed. To test the capability of LiDAR application and the effect of room light on application’s performance, a 30cm and 15.2cm lengths were evaluated using a measuring tape and a ruler in horizontal and vertical setups. Vertical measurements were used to determine the distance limit in one-meter increments. To remove inherent motion of the device being hand-held, and the effect of room light on the software’s capability, a 3D printed stand, a linear motion slide (Accuride International,Santa Fe Springs,CA), and a digital lux meter (Dr. Meter,Union City,CA) were utilized in house.

Results: Considering the LiDAR application limitations (+-1 cm), positioning, and motion effect, LiDAR measurements showed reasonable agreement with standard measuring tools.(+-1 cm). Although stationary measurement was accurate with +-1 cm, the LiDAR application was unable to report sub-centimeter and unable to define a starting point for the 15.2cm ruler at 4 meters. By calculating MU using the off-axis distance, reference plane distance, and patient field separations measured from the volunteers, agreement within 5% difference were found (2133 MU using standard tape measure vs. 2245 MU using LiDAR application). However, there are always random uncertainties with measuring and positioning volunteers/patients.

Conclusion: The feasibility of the iOS application accuracy as compared to the standard tape measure has been demonstrated. Comparable measurements were obtained but great care must be taken when utilizing LiDAR.

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