In-plane MTF measurement using sphere phantoms for step-and-shoot mode and continuous mode digital tomosynthesis systems

Changwoo Lee, Jongduk Baek

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In-plane modulation transfer function (MTF) has been widely used as a quantitative metric describing the spatial resolution of an in-plane image for a digital tomosynthesis system. Although the in-plane MTF was measured using fine wire and edge objects, precise phantom alignment along the measurement direction was one of challenging issues. To overcome this limitation, a sphere object was regarded as an alternative phantom because of spherically symmetric property. However, due to anisotropic property of tomosynthesis image, the sphere phantom has not been used to measure the in-plane MTF. In our previous work, we proposed the inverse filtering approach to measure the in-plane MTF using sphere phantoms. Using the inverse filtering approach, in this work, we measure the in-plane MTF of step-and-shoot mode and continuous mode digital tomosynthesis systems. We generated projection data of point and sphere objects in step-and-shoot mode and continuous mode tomosynthesis systems, and reconstructed using FDK algorithm. An in-plane image of reconstructed point volume was regarded as an ideal in-plane point spread function (PSF). The ideal in-plane MTF was calculated by taking Fourier transform of the ideal in-plane PSF, and fx-directional in-plane MTF was used as a reference. To measure fx-directional in-plane MTF, we divided the Fourier transform of reconstructed sphere phantom by that of ideal sphere object, and performed plane integral along the fz-direction. The estimation errors caused by inverse filtering were corrected by pseudo inverse filtering and Laplacian operator. Our results show that the in-plane MTFs of step-and-shoot mode and continuous mode are reliably estimated by the inverse filtering approach.

Original languageEnglish
Title of host publicationMedical Imaging 2018
Subtitle of host publicationPhysics of Medical Imaging
PublisherSPIE
Volume10573
ISBN (Electronic)9781510616356
DOIs
Publication statusPublished - 2018 Jan 1
EventMedical Imaging 2018: Physics of Medical Imaging - Houston, United States
Duration: 2018 Feb 122018 Feb 15

Other

OtherMedical Imaging 2018: Physics of Medical Imaging
CountryUnited States
CityHouston
Period18/2/1218/2/15

Fingerprint

digital systems
Optical transfer function
modulation transfer function
Fourier Analysis
point spread functions
Fourier transforms
Direction compound
Error analysis
spatial resolution
projection
alignment
wire
Wire
operators

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

Cite this

Lee, Changwoo ; Baek, Jongduk. / In-plane MTF measurement using sphere phantoms for step-and-shoot mode and continuous mode digital tomosynthesis systems. Medical Imaging 2018: Physics of Medical Imaging. Vol. 10573 SPIE, 2018.
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abstract = "In-plane modulation transfer function (MTF) has been widely used as a quantitative metric describing the spatial resolution of an in-plane image for a digital tomosynthesis system. Although the in-plane MTF was measured using fine wire and edge objects, precise phantom alignment along the measurement direction was one of challenging issues. To overcome this limitation, a sphere object was regarded as an alternative phantom because of spherically symmetric property. However, due to anisotropic property of tomosynthesis image, the sphere phantom has not been used to measure the in-plane MTF. In our previous work, we proposed the inverse filtering approach to measure the in-plane MTF using sphere phantoms. Using the inverse filtering approach, in this work, we measure the in-plane MTF of step-and-shoot mode and continuous mode digital tomosynthesis systems. We generated projection data of point and sphere objects in step-and-shoot mode and continuous mode tomosynthesis systems, and reconstructed using FDK algorithm. An in-plane image of reconstructed point volume was regarded as an ideal in-plane point spread function (PSF). The ideal in-plane MTF was calculated by taking Fourier transform of the ideal in-plane PSF, and fx-directional in-plane MTF was used as a reference. To measure fx-directional in-plane MTF, we divided the Fourier transform of reconstructed sphere phantom by that of ideal sphere object, and performed plane integral along the fz-direction. The estimation errors caused by inverse filtering were corrected by pseudo inverse filtering and Laplacian operator. Our results show that the in-plane MTFs of step-and-shoot mode and continuous mode are reliably estimated by the inverse filtering approach.",
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Lee, C & Baek, J 2018, In-plane MTF measurement using sphere phantoms for step-and-shoot mode and continuous mode digital tomosynthesis systems. in Medical Imaging 2018: Physics of Medical Imaging. vol. 10573, 105735N, SPIE, Medical Imaging 2018: Physics of Medical Imaging, Houston, United States, 18/2/12. https://doi.org/10.1117/12.2286453

In-plane MTF measurement using sphere phantoms for step-and-shoot mode and continuous mode digital tomosynthesis systems. / Lee, Changwoo; Baek, Jongduk.

Medical Imaging 2018: Physics of Medical Imaging. Vol. 10573 SPIE, 2018. 105735N.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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