ArticleMedical physics2025
Evaluation of novel detector readout modes for MV scatter reduction on kV images.
Article in Medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
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7 authors.
Funding
Abstract
backgroundThere is increased interest in concurrent kilovoltage (kV) imaging during megavoltage (MV) irradiation as a means of monitoring intra-fraction motion. However, scatter introduced by the MV beam degrades kV image quality, potentially making tumor visualization more challenging. PURPOSE: To implement novel imager readout modes on the on-board imager (OBI) of a Varian TrueBeam to reduce the effect of MV scatter on the kV detector.
methodsNew readout strategies (vertical 3 × 2 binning, vertical region of interest, kV pulse drop functionality) were incorporated to achieve high frame rates. A series of 120 kV images were acquired on the OBI while simultaneously irradiating a phantom with an MV beam (6xFFF and 10xFFF) with field sizes ranging from 2 × 2 cm
resultsThe amount of MV scatter was directly proportional to the square field size and the detector integration time. At their respective maximum dose rates, 6xFFF and 10xFFF produced comparable amounts of MV scatter for considered frame rates and field sizes. Increasing the frame rates from 7 to 45 fps decreased MV scatter by up to 87%. Over the same frame rates, the CNR was improved by 20% for the 2 × 2 cm
conclusionsMV scatter onto the kV detector can be significantly reduced with the implementation of the new detector readout modes. These strategies increase the CNR and thus improve the image quality.
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