Phantom study of layered sensor module for photon-counting BMD detector

Jangwon Byun, Yonghoon Kim, Jiwon Seo, Eunhye Kim, Kihyun Kim, Ajin Jo, Wonho Lee, Hyun Woo Cho, Jichul Seo, Beomjun Park

Research output: Contribution to journalArticlepeer-review


In this study, we perform bone mineral density (BMD) calculation by designing a layered sensor module (LSM) that divides high- and low-energy spectra from a single shot of X-rays. Gamma-ray evaluation supports this mechanism; low-energy gamma rays are absorbed in the front detector, whereas high-energy gamma rays are absorbed in the rear detector. In this phantom study, LSM divides a single shot of X-ray into two spectra with different distributions of energy, thereby affording X-ray images with different properties, such as contrast and gray scale. The region of interest (ROI) is classified by the Prewitt operator to sort the pixels for BMD calculation or Rs value. The calculated final value is 1.2051 g/cm2 with a standard deviation (SD) of 0.3690 g/cm2, as obtained from our previous study. An improved SD results from the layered structure with two channels for signal processing, the introduction of Rs value, and the use of Prewitt filter to sort reliable data. Overall, this study displays the feasibility of LSM for BMD calculation with a small error, thereby enabling the diagnosis of osteoporosis with novel mechanism.

Original languageEnglish
Pages (from-to)1553-1562
Number of pages10
JournalPhysical and Engineering Sciences in Medicine
Issue number4
Publication statusPublished - 2023 Dec

Bibliographical note

Publisher Copyright:
© 2023, Australasian College of Physical Scientists and Engineers in Medicine.


  • Bone mineral density
  • CdTe-based detector
  • Layered sensor module

ASJC Scopus subject areas

  • Biotechnology
  • Radiological and Ultrasound Technology
  • Biophysics
  • Biomedical Engineering
  • Instrumentation
  • Radiology Nuclear Medicine and imaging


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