Task-driven imaging in cone-beam computed tomography

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

Abstract

Purpose: Conventional workflow in interventional imaging often ignores a wealth of prior information of the patient anatomy and the imaging task. This work introduces a task-driven imaging framework that utilizes such information to prospectively design acquisition and reconstruction techniques for cone-beam CT (CBCT) in a manner that maximizes task-based performance in subsequent imaging procedures. Methods: The framework is employed in jointly optimizing tube current modulation, orbital tilt, and reconstruction parameters in filtered back-projection reconstruction for interventional imaging. Theoretical predictors of noise and resolution relates acquisition and reconstruction parameters to task-based detectability. Given a patient-specific prior image and specification of the imaging task, an optimization algorithm prospectively identifies the combination of imaging parameters that maximizes task-based detectability. Initial investigations were performed for a variety of imaging tasks in an elliptical phantom and an anthropomorphic head phantom. Results: Optimization of tube current modulation and view-dependent reconstruction kernel was shown to have greatest benefits for a directional task (e.g., identification of device or tissue orientation). The task-driven approach yielded techniques in which the dose and sharp kernels were concentrated in views contributing the most to the signal power associated with the imaging task. For example, detectability of a line pair detection task was improved by at least three fold compared to conventional approaches. For radially symmetric tasks, the task-driven strategy yielded results similar to a minimum variance strategy in the absence of kernel modulation. Optimization of the orbital tilt successfully avoided highly attenuating structures that can confound the imaging task by introducing noise correlations masquerading at spatial frequencies of interest. Conclusions: This work demonstrated the potential of a task-driven imaging framework to improve image quality and reduce dose beyond that achievable with conventional imaging approaches.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2015: Physics of Medical Imaging
PublisherSPIE
Volume9412
ISBN (Print)9781628415025
DOIs
StatePublished - 2015
EventMedical Imaging 2015: Physics of Medical Imaging - Orlando, United States
Duration: Feb 22 2015Feb 25 2015

Other

OtherMedical Imaging 2015: Physics of Medical Imaging
CountryUnited States
CityOrlando
Period2/22/152/25/15

Fingerprint

Cone-Beam Computed Tomography
Tomography
Noise
Cones
cones
tomography
Imaging techniques
Workflow
Task Performance and Analysis
Anatomy
Head
Equipment and Supplies
Modulation
modulation
optimization
acquisition
tubes
orbitals
dosage
Image quality

ASJC Scopus subject areas

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

Cite this

Gang, J., Stayman, J. W., Ouadah, S., Ehtiati, T., & Siewerdsen, J. (2015). Task-driven imaging in cone-beam computed tomography. In Medical Imaging 2015: Physics of Medical Imaging (Vol. 9412). [941220] SPIE. https://doi.org/10.1117/12.2082169

Task-driven imaging in cone-beam computed tomography. / Gang, Jianan; Stayman, Joseph Webster; Ouadah, S.; Ehtiati, T.; Siewerdsen, Jeff.

Medical Imaging 2015: Physics of Medical Imaging. Vol. 9412 SPIE, 2015. 941220.

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

Gang, J, Stayman, JW, Ouadah, S, Ehtiati, T & Siewerdsen, J 2015, Task-driven imaging in cone-beam computed tomography. in Medical Imaging 2015: Physics of Medical Imaging. vol. 9412, 941220, SPIE, Medical Imaging 2015: Physics of Medical Imaging, Orlando, United States, 2/22/15. https://doi.org/10.1117/12.2082169
Gang J, Stayman JW, Ouadah S, Ehtiati T, Siewerdsen J. Task-driven imaging in cone-beam computed tomography. In Medical Imaging 2015: Physics of Medical Imaging. Vol. 9412. SPIE. 2015. 941220 https://doi.org/10.1117/12.2082169
Gang, Jianan ; Stayman, Joseph Webster ; Ouadah, S. ; Ehtiati, T. ; Siewerdsen, Jeff. / Task-driven imaging in cone-beam computed tomography. Medical Imaging 2015: Physics of Medical Imaging. Vol. 9412 SPIE, 2015.
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