Mr. Derrek Spronk Profile

Derrek Spronk

at UNC-Chapel Hill

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Author

Publications (10)

Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Stationary head CT scanner using CNT x-ray source arrays

Derrek Spronk, Yueting Luo, Christina Inscoe, Otto Zhou, Jianping Lu, Yueh Lee

Proc. SPIE. 11595, Medical Imaging 2021: Physics of Medical Imaging

KEYWORDS: X-ray computed tomography, Imaging systems, Sensors, Scanners, X-rays, X-ray sources, Control systems, Head, Computed tomography, Carbon nanotubes

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Stationary head CT with linear CNT x-ray source arrays: image quality assessment through simulation

Yueting Luo, Derrek Spronk, Christina Inscoe, Yueh Lee, Otto Zhou, Jianping Lu

Proc. SPIE. 11595, Medical Imaging 2021: Physics of Medical Imaging

KEYWORDS: Signal to noise ratio, X-ray computed tomography, Imaging systems, Sensors, X-ray sources, Head, Image quality, Reconstruction algorithms, Imaging arrays, Prototyping

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Proceedings Article | 16 March 2020 Paper

Simulation and optimization of system configuration for the stationary head CT using CNT x-ray source array: reconstruction and quality evaluation

Yueting Luo, Derrek Spronk, Yueh Lee, Otto Zhou, Jianping Lu

Proc. SPIE. 11312, Medical Imaging 2020: Physics of Medical Imaging

KEYWORDS: X-ray computed tomography, Imaging systems, X-rays, X-ray sources, Detector arrays, Head, Image quality, Reconstruction algorithms, Carbon nanotubes

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Proceedings Article | 16 March 2020 Paper

Feasibility of a stationary head CT scanner using a CNT x-ray source array

Derrek Spronk, Yueting Luo, Christy Inscoe, Alex Billingsley, Yueh Lee, Jianping Lu, Otto Zhou

Proc. SPIE. 11312, Medical Imaging 2020: Physics of Medical Imaging

KEYWORDS: X-ray computed tomography, Imaging systems, Sensors, Calibration, Scanners, X-rays, X-ray sources, Head, Image quality, Reconstruction algorithms

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Purpose: Today’s state-of-the-art CT systems rely on a rotating gantry to acquire projections spanning up to 360 degrees around the head and/or body. By replacing the rotating source and detector with a stationary array of x-ray sources and line detectors, a head CT scanner could be potentially constructed with a small footprint and fast scanning speed. The purpose of this project is to design and construct a stationary head CT (s-HCT) scanner capable of diagnosis of stroke and head trauma patients in limited resource areas such as forward operating bases. Here we present preliminary imaging results which demonstrate the feasibility of such a system using carbon nanotube (CNT) x-ray source arrays.

Methods: The feasibility study was performed using a benchtop setup consisting of an x-ray source array with 45 distributed focal spots, each operating at 120kVp, and an Electronic Control System (ECS) for high speed control of the x-ray output from individual focal spots. The projection data was collected by an array of detectors configured specifically for head imaging. The basic performance of the CNT x-ray source array was characterized. By rotating the object in discrete angular steps, a potential s-HCT configuration was emulated. The collected projection images were reconstructed using an iterative reconstruction algorithm developed specifically for this configuration. Evaluation of the image quality was completed by comparing this image of the ACR CT phantom obtained with the s-HCT to that obtained by a clinical CT scanner.

Results: The CNT x-ray source array was found to have a consistent focal spot size of 1.3×1.1 mm² for all beams (IEC 1.0). At 120 kVp the HVL was measured to be 5.8 mm Al. Axial images have been acquired with slice thickness 2.5 mm to evaluate the imaging performance of the s-HCT system. Contrast-noise-ratio was measured for the acrylic (120 HU) and water (0 HU) materials in the ACR CT 464 phantom Module 01. A value of 5.2 is reported for the benchtop setup with an entrance dose of 2.9 mGy, compared to the clinical measurement of 30.5 found at 74.5 mGy. These images demonstrate that the s-HCT system based on CNT x-ray source arrays is feasible.

Conclusion: Customized CNT x-ray sources were developed specifically for head CT imaging. The feasibility of using this source array to construct a s-HCT scanner has been demonstrated by emulating a potential CT configuration. It is shown that diagnostic quality CT images can be obtained using the proposed system geometry. These preliminary images provide confidence that a s-HCT system can be constructed for clinical evaluation.

Proceedings Article | 22 March 2016 Paper

A new generation of stationary digital breast tomosynthesis system with wider angular span and faster scanning time

Jabari Calliste, Gongting Wu, Philip Laganis, Derrek Spronk, Houman Jafari, Kyle Olson, Bo Gao, Yueh Lee, Otto Zhou, Jianping Lu

Proc. SPIE. 9783, Medical Imaging 2016: Physics of Medical Imaging

KEYWORDS: Gold, Breast, Curium, Imaging systems, Sensors, X-rays, X-ray sources, Diagnostics, Image acquisition, Image resolution, Modulation transfer functions, Spatial resolution, X-ray imaging, Visibility, Digital breast tomosynthesis

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Proceedings Article | 6 March 2013 Paper

Rectangular computed tomography using a stationary array of CNT emitters: initial experimental results

Brian Gonzales, Derrek Spronk, Yuan Cheng, Zheng Zhang, Xiaochuan Pan, Moritz Beckmann, Otto Zhou, Jianping Lu

Proc. SPIE. 8668, Medical Imaging 2013: Physics of Medical Imaging

KEYWORDS: X-ray computed tomography, Fluctuations and noise, Imaging systems, Sensors, X-rays, Computed tomography, Reconstruction algorithms, X-ray imaging, Scatter measurement, X-ray detectors

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Proceedings Article | 9 March 2012 Paper

A stationary digital breast tomosynthesis scanner

Xin Qian, Andrew Tucker, Emily Gidcumb, Jianping Lu, Otto Zhou, Derrek Spronk, Frank Sprenger, Yiheng Zhang, Don Kennedy, Tom Farbizio, Zhenxue Jing

Proc. SPIE. 8313, Medical Imaging 2012: Physics of Medical Imaging

KEYWORDS: Sensors, Electrodes, Scanners, X-rays, X-ray sources, Image quality, Mammography, X-ray imaging, X-ray detectors, Digital breast tomosynthesis

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Proceedings Article | 2 March 2012 Paper

Optimizing configuration parameters of a stationary digital breast tomosynthesis system based on carbon nanotube x-ray sources

Andrew Tucker, Xin Qian, Emily Gidcumb, Derrek Spronk, Frank Sprenger, Johnny Kuo, Susan Ng, Jianping Lu, Otto Zhou

Proc. SPIE. 8313, Medical Imaging 2012: Physics of Medical Imaging

KEYWORDS: Signal to noise ratio, Imaging systems, Sensors, X-rays, X-ray sources, Image quality, Mammography, Modulation transfer functions, Digital breast tomosynthesis, Carbon nanotubes

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Proceedings Article | 17 March 2011 Paper

Stationary digital breast tomosynthesis with distributed field emission x-ray tube

F. Sprenger, X. Calderon, E. Gidcumb, J. Lu, X. Qian, D. Spronk, A. Tucker, G. Yang, O. Zhou

Proc. SPIE. 7961, Medical Imaging 2011: Physics of Medical Imaging

KEYWORDS: Electron beams, Sensors, Electrodes, X-rays, X-ray sources, Ions, Manufacturing, X-ray imaging, Digital breast tomosynthesis, Carbon nanotubes

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Proceedings Article | 23 March 2010 Paper

Distributed source x-ray tube technology for tomosynthesis imaging

F. Sprenger, X. Calderon-Colon, Y. Cheng, K. Englestad, J. Lu, J. Maltz, A. Paidi, X. Qian, D. Spronk, S. Sultana, G. Yang, O. Zhou

Proc. SPIE. 7622, Medical Imaging 2010: Physics of Medical Imaging

KEYWORDS: Imaging systems, Sensors, Calibration, X-rays, X-ray sources, Electrons, Image acquisition, Radiotherapy, X-ray imaging, X-ray technology

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Showing 5 of 10 publications

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