Dr. Guozhi Zhang Profile

Dr. Guozhi Zhang

Physicist at United Imaging Heathcare

Publications (19)

Proceedings Article | 1 April 2024 Poster + Paper

Genuine “one-stop-shop” stress myocardial CT perfusion: taking full advantage of a 320-row CT imaging system

Wanhui Zhou, Cheng Yan, Shijie Xu, Wei Wang, Wenying Wang, Guozhi Zhang

Proceedings Volume 12925, 129251X (2024) https://doi.org/10.1117/12.3005474

KEYWORDS: Computed tomography, Imaging systems, Heart, Reconstruction algorithms, Sampling rates, Perfusion imaging, Image quality, Arteries, Image visualization

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SPIE Journal Paper | 27 April 2021

On the relevance of modulation transfer function measurements in digital mammography quality control

Kristina Wigati, Nicholas Marshall, Kim Lemmens, Joke Binst, Annelies Jacobs, Lesley Cockmartin, Guozhi Zhang, Liesbeth Vancoillie, Dimitar Petrov, Dirk A. Vandenbroucke, Djarwani Soejoko, Hilde Bosmans

JMI, Vol. 8, Issue 02, 023505, (April 2021) https://doi.org/10.1117/12.10.1117/1.JMI.8.2.023505

KEYWORDS: Modulation transfer functions, Sensors, Switches, Image quality, Chromium, Gold, X-ray detectors, Systems modeling, Scintillators, Medical imaging

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SPIE Journal Paper | 29 December 2020 Open Access

Erratum: verification of the accuracy of a hybrid breast imaging simulation framework for virtual clinical trial applications

Liesbeth Vancoillie, Nicholas Marshall, Lesley Cockmartin, Janne Vignero, Guozhi Zhang, Hilde Bosmans

JMI, Vol. 7, Issue 06, 069801, (December 2020) https://doi.org/10.1117/12.10.1117/1.JMI.7.6.069801

KEYWORDS: Virtual reality, Clinical trials, Breast imaging, Radiology, Pathology, Medical physics

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SPIE Journal Paper | 22 April 2020

Verification of the accuracy of a hybrid breast imaging simulation framework for virtual clinical trial applications

Liesbeth Vancoillie, Nicholas Marshall, Lesley Cockmartin, Janne Vignero, Guozhi Zhang, Hilde Bosmans

JMI, Vol. 7, Issue 04, 042804, (April 2020) https://doi.org/10.1117/12.10.1117/1.JMI.7.4.042804

KEYWORDS: Visualization, Digital breast tomosynthesis, Modulation transfer functions, Optical spheres, Aluminum, Breast imaging, Image processing, 3D modeling, Photovoltaics, Polymethylmethacrylate

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Proceedings Article | 16 March 2020 Paper

Implementation, validation and application of a tool for the assessment of the modulation transfer function and noise power spectrum of dental CBCT scanners

K. Merken, G. Zhang, E. Shaheen, R. Jacobs, C. Politis, H. Bosmans

Proceedings Volume 11312, 113122T (2020) https://doi.org/10.1117/12.2549569

KEYWORDS: Modulation transfer functions, Imaging systems, 3D scanning, Scanners, 3D metrology, Laser scanners, Computed tomography, Image quality, Reconstruction algorithms, Manufacturing

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SPIE Journal Paper | 23 March 2019

Model and human observer reproducibility for detection of microcalcification clusters in digital breast tomosynthesis images of three-dimensionally structured test object

Dimitar Petrov, Nicholas Marshall, Kenneth Young, Guozhi Zhang, Hilde Bosmans

JMI, Vol. 6, Issue 01, 015503, (March 2019) https://doi.org/10.1117/12.10.1117/1.JMI.6.1.015503

KEYWORDS: Digital breast tomosynthesis, Molybdenum, Particles, 3D modeling, Visualization, Breast, 3D image processing, Target detection, Reconstruction algorithms, Mammography

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Proceedings Article | 1 March 2019 Presentation + Paper

A case study on the impact of a reduction in MTF on test object detectability score in mammography

K. T. Wigati, H. Bosmans, L. Cockmartin, G. Zhang, L. Vancoillie, D. Petrov, D. A. Vandenbroucke, D. Soejoko, N. Marshall

Proceedings Volume 10948, 109480J (2019) https://doi.org/10.1117/12.2513285

KEYWORDS: Sensors, Chromium, Gold, Polymethylmethacrylate, Aluminum

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Proceedings Article | 6 July 2018 Paper

Performance evaluation of a 3D structured phantom with simulated lesions on breast imaging systems

Liesbeth Vancoillie, Lesley Cockmartin, Kristina Tri Wigati, Dimitar Petrov, Guozhi Zhang, Nicholas Marshall, Hilde Bosmans

Proceedings Volume 10718, 107180Y (2018) https://doi.org/10.1117/12.2318472

KEYWORDS: Digital breast tomosynthesis, 3D modeling, Target detection, 3D image processing, Imaging systems, Polymethylmethacrylate, Breast, Systems modeling, Breast imaging, Digital mammography

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Proceedings Article | 9 March 2018 Paper

Accurate centroid determination for evaluating the modulation transfer function with a circular edge in CT images

Guozhi Zhang, Andreas Stratis, Nicholas Marshall, Hilde Bosmans

Proceedings Volume 10573, 1057344 (2018) https://doi.org/10.1117/12.2292908

KEYWORDS: Modulation transfer functions, Computed tomography, 3D image processing, Point spread functions, Image registration, Spatial resolution, Binary data, Image quality, Algorithm development, CT reconstruction

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Proceedings Article | 9 March 2018 Paper

The effects of tube current modulation on the noise power spectra of patients with different size: consequences for quality monitoring

Alexandro Fulco, Lesley Cockmartin, Hilde Bosmans, Johan Coolen, Guozhi Zhang, Nicholas Marshall

Proceedings Volume 10573, 1057341 (2018) https://doi.org/10.1117/12.2294579

KEYWORDS: Computed tomography, Image quality, Scanners, Modulation, Signal to noise ratio, Spatial frequencies, Visualization, Fluctuations and noise

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Aim: Since dose reduction techniques such as tube current modulation may impact noise and consequently the performance that can be achieved with CT images, it is important to establish quality monitoring. We have studied whether it would be possible and relevant to implement an (automatical) procedure to retrieve and possibly alert for patients with relatively high noise levels in CT in comparison to similar cases. Proper alerting would make clinical quality supervision more efficient. Material and methods: Two homogeneous phantoms consisting of different diameters were scanned following a routine CT thorax protocol on a Siemens SOMATOM Force scanner and noise power spectra were calculated for the different phantom sizes. Next, forty-four patients, scanned with the same CT thorax protocol and reconstructed with a hard kernel (lung) and soft kernel (liver), were retrieved from PACS. Noise power spectra (NPS) were calculated for regions in the lung and liver, and evaluated over different frequency ranges. We hypothesized that the high frequency part correlates better with dose than the low frequency part that is determined by anatomical noise. Therefore we focused on the correlation of high frequency noise and dose versus patient size. Water equivalent diameters (WED) were calculated as a metric of patient size. Additionally, all patients were rated subjectively by an experienced thorax radiologist for their overall image quality and presence of diagnostically acceptable noise. Statistical correlations and outliers were investigated. Results: While the correlations between NPS and dose and patient size were not significant for the lung, a positive correlation of NPS measured in the liver with CTDIvol and WED was found (e.g. R² = 0.31 for NPS(high frequencies) versus WED). The combined visualization of NPS at high frequencies, WED and CTDI_vol showed some interesting outliers, however they did not receive lower image quality ratings. Conclusions: This work described how the Siemens SOMATOM Force scanner balances patient size, dose and image noise for a routine CT thorax protocol. However, since the outliers in both dose and (high frequency) noise levels still result in adequate to very good image quality scores, it is suggested that (straightforward) dose outlier based alerting should be the first task in dose-quality surveys on the particular scanner.

Proceedings Article | 9 March 2017 Paper

An adaptive toolkit for image quality evaluation in system performance test of digital breast tomosynthesis

Guozhi Zhang, Dimitar Petrov, Nicholas Marshall, Hilde Bosmans

Proceedings Volume 10132, 1013249 (2017) https://doi.org/10.1117/12.2253871

KEYWORDS: Sensors, Signal to noise ratio, Imaging systems, Digital breast tomosynthesis, Image quality, Image processing, Modulation transfer functions, Breast

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Proceedings Article | 24 March 2016 Paper

Development and application of a channelized Hotelling observer for DBT optimization on structured background test images with mass simulating targets

Dimitar Petrov, Koen Michielsen, Lesley Cockmartin, Gouzhi Zhang, Kenneth Young, Nicholas Marshall, Hilde Bosmans

Proceedings Volume 9787, 97871K (2016) https://doi.org/10.1117/12.2216713

KEYWORDS: Digital breast tomosynthesis, Image quality standards, 3D modeling, Mammography, 3D acquisition, Diagnostics, Performance modeling, Reconstruction algorithms, Target detection, Optical spheres, Image quality, Detection and tracking algorithms

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Proceedings Article | 24 March 2016 Paper

A four-alternative forced choice (4AFC) software for observer performance evaluation in radiology

Guozhi Zhang, Lesley Cockmartin, Hilde Bosmans

Proceedings Volume 9787, 97871E (2016) https://doi.org/10.1117/12.2216386

KEYWORDS: Radiology, Image analysis, Digital imaging, Surgery, Digital breast tomosynthesis, Medical imaging, Breast, Analytical research, Image quality, Computed tomography, Magnetic resonance imaging

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Proceedings Article | 18 March 2015 Paper

A Monte Carlo study on the effect of the orbital bone to the radiation dose delivered to the eye lens

Andreas Stratis, Guozhi Zhang, Reinhilde Jacobs, Ria Bogaerts, Hilde Bosmans

Proceedings Volume 9412, 941231 (2015) https://doi.org/10.1117/12.2082029

KEYWORDS: Bone, Tissues, Eye, Backscatter, Monte Carlo methods, Interfaces, Head, Natural surfaces, X-rays, Electrons

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SPIE Journal Paper | 30 December 2014

Implementing the complete beam hardening effect of the bowtie filter versus scaling beam intensities: effects on dosimetric applications in computed tomography

Xochitl Lopez-Rendon, Guozhi Zhang, Hilde Bosmans, Raymond Oyen, Federica Zanca

JMI, Vol. 1, Issue 03, 033507, (December 2014) https://doi.org/10.1117/12.10.1117/1.JMI.1.3.033507

KEYWORDS: Monte Carlo methods, Fluctuations and noise, Computed tomography, Photons, Gold, Aluminum, Image filtering, Optical filters, X-rays, Signal attenuation

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Proceedings Article | 19 March 2014 Paper

Beam hardening and partial beam hardening of the bowtie filter: Effects on dosimetric applications in CT

X. Lopez-Rendon, G. Zhang, H. Bosmans, R. Oyen, F. Zanca

Proceedings Volume 9033, 903341 (2014) https://doi.org/10.1117/12.2042843

KEYWORDS: Monte Carlo methods, Fluctuations and noise, Aluminum, Signal attenuation, Gold, X-rays, Optical filters, Optical simulations, X-ray computed tomography, Scanners

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Proceedings Article | 6 March 2013 Paper

A model-based volume restoration approach for Monte Carlo scatter correction in image reconstruction of cone beam CT with limited field of view

Guozhi Zhang, Reinhilde Jacobs, Hilde Bosmans

Proceedings Volume 8668, 86682P (2013) https://doi.org/10.1117/12.2007693

KEYWORDS: Monte Carlo methods, 3D image reconstruction, 3D image processing, Image registration, 3D modeling, Reconstruction algorithms, Image segmentation, Image quality, Image restoration, Tissues

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Proceedings Article | 3 March 2012 Paper

Assessment of the central artifact in cone beam CT imaging with an offset geometry

Guozhi Zhang, Reinhilde Jacobs, Johan Nuyts, Hilde Bosmans

Proceedings Volume 8313, 83132U (2012) https://doi.org/10.1117/12.911102

KEYWORDS: 3D scanning, Computer simulations, Monte Carlo methods, Imaging systems, Image restoration, Reconstruction algorithms, Head, Polymethylmethacrylate, 3D modeling, Modulation transfer functions

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Proceedings Article | 6 February 2008 Paper

Conversion coefficients for external monoenergic photon beams in the visible Chinese human model

Qian Liu, Guozhi Zhang, Shaoqun Zeng

Proceedings Volume 6855, 68550J (2008) https://doi.org/10.1117/12.763417

KEYWORDS: Mathematical modeling, Data modeling, Tissues, Particles, Intestine, Bone, Radiation dosimetry, Radiation effects, Skin, Bladder

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Showing 5 of 19 publications

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