Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system

Junhan Park; Changwoo Lee; Jongduk Baek

doi:10.1117/12.2081342

Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system

Junhan Park, Changwoo Lee, Jongduk Baek

School of Integrated Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

In medical imaging systems, several factors (e.g., reconstruction algorithm, noise structures, target size, contrast, etc) affect the detection performance and need to be considered for object detection. In a cone beam CT system, FDK reconstruction produces different noise structures in axial and coronal slices, and thus we analyzed directional dependent detectability of objects using detection SNR of Channelized Hotelling observer. To calculate the detection SNR, difference-of-Gaussian channel model with 10 channels was implemented, and 20 sphere objects with different radius (i.e., 0.25 (mm) to 5 (mm) equally spaced by 0.25 (mm)), reconstructed by FDK algorithm, were used as object templates. Covariance matrix in axial and coronal direction was estimated from 3000 reconstructed noise volumes, and then the SNR ratio between axial and coronal direction was calculated. Corresponding 2D noise power spectrum was also calculated. The results show that as the object size increases, the SNR ratio decreases, especially lower than 1 when the object size is larger than 2.5 mm radius. The reason is because the axial (coronal) noise power is higher in high (low) frequency band, and therefore the detectability of a small (large) object is higher in coronal (axial) images. Our results indicate that it is more beneficial to use coronal slices in order to improve the detectability of a small object in a cone beam CT system.

Original language	English
Title of host publication	Medical Imaging 2015
Subtitle of host publication	Image Perception, Observer Performance, and Technology Assessment
Editors	Claudia R. Mello-Thoms, Matthew A. Kupinski, Claudia R. Mello-Thoms
Publisher	SPIE
ISBN (Electronic)	9781628415063
DOIs	https://doi.org/10.1117/12.2081342
Publication status	Published - 2015
Event	Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment - Orlando, United States Duration: 2015 Feb 25 → 2015 Feb 26

Publication series

Name	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume	9416
ISSN (Print)	1605-7422

Other

Other	Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment
Country/Territory	United States
City	Orlando
Period	15/2/25 → 15/2/26

Bibliographical note

Publisher Copyright:
© 2015 SPIE.

All Science Journal Classification (ASJC) codes

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

Access to Document

10.1117/12.2081342

Cite this

Park, J., Lee, C., & Baek, J. (2015). Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system. In C. R. Mello-Thoms, M. A. Kupinski, & C. R. Mello-Thoms (Eds.), Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment Article 94161H (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9416). SPIE. https://doi.org/10.1117/12.2081342

Park, Junhan ; Lee, Changwoo ; Baek, Jongduk. / Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system. Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment. editor / Claudia R. Mello-Thoms ; Matthew A. Kupinski ; Claudia R. Mello-Thoms. SPIE, 2015. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE).

@inproceedings{713dfefca4b04b4e9686f9126e72b208,

title = "Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system",

abstract = "In medical imaging systems, several factors (e.g., reconstruction algorithm, noise structures, target size, contrast, etc) affect the detection performance and need to be considered for object detection. In a cone beam CT system, FDK reconstruction produces different noise structures in axial and coronal slices, and thus we analyzed directional dependent detectability of objects using detection SNR of Channelized Hotelling observer. To calculate the detection SNR, difference-of-Gaussian channel model with 10 channels was implemented, and 20 sphere objects with different radius (i.e., 0.25 (mm) to 5 (mm) equally spaced by 0.25 (mm)), reconstructed by FDK algorithm, were used as object templates. Covariance matrix in axial and coronal direction was estimated from 3000 reconstructed noise volumes, and then the SNR ratio between axial and coronal direction was calculated. Corresponding 2D noise power spectrum was also calculated. The results show that as the object size increases, the SNR ratio decreases, especially lower than 1 when the object size is larger than 2.5 mm radius. The reason is because the axial (coronal) noise power is higher in high (low) frequency band, and therefore the detectability of a small (large) object is higher in coronal (axial) images. Our results indicate that it is more beneficial to use coronal slices in order to improve the detectability of a small object in a cone beam CT system.",

author = "Junhan Park and Changwoo Lee and Jongduk Baek",

note = "Publisher Copyright: {\textcopyright} 2015 SPIE.; Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment ; Conference date: 25-02-2015 Through 26-02-2015",

year = "2015",

doi = "10.1117/12.2081342",

language = "English",

series = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",

publisher = "SPIE",

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Park, J, Lee, C & Baek, J 2015, Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system. in CR Mello-Thoms, MA Kupinski & CR Mello-Thoms (eds), Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment., 94161H, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 9416, SPIE, Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment, Orlando, United States, 15/2/25. https://doi.org/10.1117/12.2081342

Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system. / Park, Junhan; Lee, Changwoo; Baek, Jongduk.
Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment. ed. / Claudia R. Mello-Thoms; Matthew A. Kupinski; Claudia R. Mello-Thoms. SPIE, 2015. 94161H (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9416).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system

AU - Park, Junhan

AU - Lee, Changwoo

AU - Baek, Jongduk

PY - 2015

Y1 - 2015

N2 - In medical imaging systems, several factors (e.g., reconstruction algorithm, noise structures, target size, contrast, etc) affect the detection performance and need to be considered for object detection. In a cone beam CT system, FDK reconstruction produces different noise structures in axial and coronal slices, and thus we analyzed directional dependent detectability of objects using detection SNR of Channelized Hotelling observer. To calculate the detection SNR, difference-of-Gaussian channel model with 10 channels was implemented, and 20 sphere objects with different radius (i.e., 0.25 (mm) to 5 (mm) equally spaced by 0.25 (mm)), reconstructed by FDK algorithm, were used as object templates. Covariance matrix in axial and coronal direction was estimated from 3000 reconstructed noise volumes, and then the SNR ratio between axial and coronal direction was calculated. Corresponding 2D noise power spectrum was also calculated. The results show that as the object size increases, the SNR ratio decreases, especially lower than 1 when the object size is larger than 2.5 mm radius. The reason is because the axial (coronal) noise power is higher in high (low) frequency band, and therefore the detectability of a small (large) object is higher in coronal (axial) images. Our results indicate that it is more beneficial to use coronal slices in order to improve the detectability of a small object in a cone beam CT system.

AB - In medical imaging systems, several factors (e.g., reconstruction algorithm, noise structures, target size, contrast, etc) affect the detection performance and need to be considered for object detection. In a cone beam CT system, FDK reconstruction produces different noise structures in axial and coronal slices, and thus we analyzed directional dependent detectability of objects using detection SNR of Channelized Hotelling observer. To calculate the detection SNR, difference-of-Gaussian channel model with 10 channels was implemented, and 20 sphere objects with different radius (i.e., 0.25 (mm) to 5 (mm) equally spaced by 0.25 (mm)), reconstructed by FDK algorithm, were used as object templates. Covariance matrix in axial and coronal direction was estimated from 3000 reconstructed noise volumes, and then the SNR ratio between axial and coronal direction was calculated. Corresponding 2D noise power spectrum was also calculated. The results show that as the object size increases, the SNR ratio decreases, especially lower than 1 when the object size is larger than 2.5 mm radius. The reason is because the axial (coronal) noise power is higher in high (low) frequency band, and therefore the detectability of a small (large) object is higher in coronal (axial) images. Our results indicate that it is more beneficial to use coronal slices in order to improve the detectability of a small object in a cone beam CT system.

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M3 - Conference contribution

AN - SCOPUS:84932178047

T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE

BT - Medical Imaging 2015

A2 - Mello-Thoms, Claudia R.

A2 - Kupinski, Matthew A.

A2 - Mello-Thoms, Claudia R.

PB - SPIE

T2 - Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment

Y2 - 25 February 2015 through 26 February 2015

ER -

Park J, Lee C, Baek J. Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system. In Mello-Thoms CR, Kupinski MA, Mello-Thoms CR, editors, Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment. SPIE. 2015. 94161H. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE). doi: 10.1117/12.2081342

Investigation on viewing direction dependent detectability in a reconstructed 3D volume for a cone beam CT system

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