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Feasibility Study of a Curved Flexible Probe for Abdominal Imaging During Radiation Therapy

J Zhou1*, X Huang2, H Endou3, K Sasaki4, H Hooshangnejad 5, D Han6, K Ding7, (1) Johns Hopkins University, Baltimore, MD, (2)Johns Hopkins University, Baltimore, MD, (3) Hitachi, Hitachi City, Japan,(4) Hitachi, Hitachi City, Japan,(5) Johns Hopkins university, Baltimore, MD, (6) Johns Hopkins University, Baltimore, MD, (7) Johns Hopkins University, Baltimore, MD

Presentations

(Sunday, 7/12/2020)   [Eastern Time (GMT-4)]

Room: AAPM ePoster Library

Purpose: evaluate the image quality of a lightweight flexible ultrasound (US) probe developed for image-guided proton therapy on a geometric phantom.

Methods: 1.5 mm thick flexible probe was developed for imaging abdominal tumors during proton treatment. The US images were acquired in three predefined curvatures with the flexible probe at the radius of 304.8 mm (12 inches), 203.2 mm (8 inches) and infinity (flat) to mimic the curvatures of a human torso with different sizes. Full matrix capture and total focusing method were applied for US transmission and image reconstruction respectively. A geometric phantom was used for testing. The final images were compared to the image obtained from a standard diagnostic US probe (L7-4).

Results: the circular contrast targets in the geometric phantom are visible from both the flexible probe. The circular target at 6 cm depth was used to evaluate the impact of the curvature of the flexible probe on the image distortion. The circle diameter is 65 mm for the diagnostic probe. The diameter of the target was 58 mm when the flexible probe lay flat on the surface. When the flexible probe was curved at radius of 304.8 mm and 203.2 mm, the apparent diameters are 50 mm and 53 mm. The signal to noise ratios (SNR) for images taken with the diagnostic probe and the flexible probe at radius of 304.8 mm, 203.2 mm and infinity are 2.81, 2.09, 2.03, and 2.29 respectively.

Conclusion: signal to noise ratio was above 2.0 for all images taken with the flexible probe at varied curvatures. The apparent size of the target is significantly smaller than with the diagnostic probe and varies depending on the curvature. Future studies will focus on the developing method for the correction of geometric distortion.

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