Abstract
Cone‐beam digital tomosynthesis (CBDT) is a new approach that was recently proposed for rapid tomographic imaging of soft‐tissue targets in the radiotherapy treatment room. One of the potential problems in implementing CBDT using, for example, megavoltage (MV) X rays is the possibility of artifacts caused by image lag and ghosting of the X‐ray detector used. In the present work, we developed a model to correct for image lag with indirect‐conversion flat‐panel imagers (FPIs) used for MV‐CBDT. This model is based on measurement and analysis of image lag in an indirect‐conversion FPI irradiated with a 6‐MV X‐ray beam. Our results demonstrated that image lag is amenable to correction. In addition, we measured the ghosting effect for an indirect‐conversion FPI and found it to be insignificant.PACS numbers: 87.53.Oq, 87.57.Ce
Highlights
Motion of soft-tissue targets, such as that of a lung tumor, is one of the main concerns in high-precision radiation therapy.[1,2,3] Cone-beam digital tomosynthesis (CBDT) is a new approach that was recently proposed for rapid tomographic imaging of soft-tissue targets in the radiotherapy treatment room.[4,5,6] Because it utilizes partial scans, CBDT can be thought of as limited-angle cone-beam computed tomography (CBCT).(7–9) The main advantage of CBDT is that it is faster than CBCT, and it can potentially be used for image-guided lung treatment
We developed a model to correct for image lag in indirect-conversion flat-panel imagers (FPIs) used in MV-CBDT
We investigated image lag and ghosting for an indirect-conversion FPI at 6 MV
Summary
Motion of soft-tissue targets, such as that of a lung tumor, is one of the main concerns in high-precision radiation therapy.[1,2,3] Cone-beam digital tomosynthesis (CBDT) is a new approach that was recently proposed for rapid tomographic imaging of soft-tissue targets in the radiotherapy treatment room.[4,5,6] Because it utilizes partial scans (typically in the range 20 – 60 degrees of gantry arc), CBDT can be thought of as limited-angle cone-beam computed tomography (CBCT).(7–9) The main advantage of CBDT is that it is faster than CBCT, and it can potentially be used for image-guided lung treatment (for example). Image lag is not necessarily a concern for radiographic imaging of a static target (for example, the bony anatomy of a patient) with a fixed gantry angle—as in conventional portal imaging.[21] it is a concern for MV-CBDT, in which fluoroscopic imaging is required, given that either the target or the gantry is moving during image acquisition Previous work in this area has focused on quantifying image lag and ghosting and their effects on image quality.[15,16,17,18,19,20] little work has been done to correct for the lag and ghosting effects, especially for MV X-ray imaging. We developed a model to correct for image lag in indirect-conversion FPIs used in MV-CBDT. We measured the ghosting effect for indirect-conversion FPI and found it to be insignificant
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