Development and performances of a dental digital radiographic system using a high resolution CCD image sensor

Kim, Jong-Ho; So, Su-Gil; Joo, Koan-Sik

doi:10.1109/nssmic.2004.1462556

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…The measured endoDPT x-ray sensor MTF shown in figure 5(a) was consistent with other studies using dental sensors and opaque edge MTF phantoms [37-40. ] In particular, this result showed good agreement with the study by Kim et al [39]. using a similar scintillation dental x-ray sensor (22 mm pixels) with the measured x-ray sensor MTF falling to 90%, 50%, and 10% magnitudes at -0.25 mm , with the improved resolution in endoDPT most likely due to the smaller x-ray sensor detection element size and reduced focal spot blurring from a large SID.…”

Section: Discussionsupporting

confidence: 90%

“…This result demonstrated the x-ray sensor's high in-plane resolution when used in endoDPT geometry with long SID. As dental imaging is well known to provide very high resolution images compared to typical body imaging [37][38][39][40], this result indicated that the collected data in an endoDPT scan (two-dimensional projection images) will have similar high resolution. This high spatial resolution will provide advantages for imaging small structures in the prostate such as LDRBT seeds; the clinical significance of improved LDRBT seed imaging is discussed below in the paragraphs regarding the canine prostate specimens implanted with LDRBT seeds.…”

Section: Discussionmentioning

confidence: 88%

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Endorectal digital prostate tomosynthesis (endoDPT): a proof-of-concept study

Steiner¹,

Matthews²,

Jia³

2021

Biomed. Phys. Eng. Express

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In this study we present endorectal digital prostate tomosynthesis (endoDPT), a proposed method of high resolution prostate imaging using an endorectal x-ray sensor and an external x-ray source. endoDPT may be useful for visualizing the fine detail of small structures such as low dose rate brachytherapy (LDRBT) seeds that are difficult to visualize with current methods. The resolution of endoDPT was characterized through measurement of the modulation transfer function (MTF) and artifact spread function (ASF) in computational and physical phantoms. The qualitative resolution of endoDPT was assessed relative to computed tomography (CT) through imaging of LDRBT seeds implanted in ex vivo canine prostates. The x-ray sensor MTF reached 10% at 11.50 mm−1, the reconstruction algorithm MTF reached a maximum at 7.08 mm−1, and the ASF was 2.5 mm (full-width at half-maximum). Fine structures in LDRBT seeds like the 0.05 mm thick shell were visible with endoDPT but not CT. All endoDPT images exhibited an overshoot artifact. The measured MTFs were consistent with other studies using similar x-ray sensors and demonstrated improved resolution compared to digital breast tomosynthesis; this result was due to the smaller endoDPT x-ray sensor detection element size and quantitatively demonstrates the high resolution of endoDPT. The ASF demonstrated worse depth resolution compared to in-plane resolution, due to partial angular sampling; partial angular sampling also caused the observed overshoot artifact in the endoDPT images. However, endoDPT still was able to visualize fine structures such as the LDRBT seed shell to a much higher degree than CT. This high-resolution visualization may be useful for improvements in patient specific LDRBT dosimetry. Overall, these results indicate endoDPT is capable of high in-plane spatial resolution and is thus well poised for optimization and studies assessing clinical utility.

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Section: Discussionsupporting

confidence: 90%