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Interactive image segmentation of MARS datasets using bag of features
/ Kanithi, Praveenkumar (Canterbury U.) ; de Ruiter, Niels J A (Canterbury U. ; Otago U. ; MARS Bioimaging) ; Amma, Maya R (Otago U.) ; Lindeman, Robert W (Canterbury U.) ; Butler, Anthony P H (Canterbury U. ; MARS ; Otago U. ; CERN) ; Butler, Philip H (Canterbury U. ; MARS Bioimaging ; Otago U. ; CERN) ; Chernoglazov, Alexander I (Canterbury U. ; MARS Bioimaging) ; Mandalika, V B H (Canterbury U. ; MARS Bioimaging) ; Adebileje, Sikiru A (Canterbury U. ; Otago U.) ; Alexander, Steven D (MARS Bioimaging) et al.
In this paper, we propose a slice-based interactive segmentation of spectral CT datasets using a bag of features method. The data is acquired from a MARS scanner which divides up the x-ray spectrum into multiple energy bins for imaging. [...]
2021 - 9 p.
- Published in : IEEE Trans. Rad. Plasma Med. Sci. 5 (2021) 559 - 567
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Medipix3RX neutron camera for ambient radiation measurements in the CMS cavern
/ Bheesette, Srinidhi (Otago U. ; CERN) ; Lokhovitskiy, Arkady (CERN) ; Mallows, Sophie (CERN) ; Walsh, Michael F (MARS Bioimaging) ; Doesburg, Robert M N (MARS Bioimaging) ; Bell, Stephen T (MARS Bioimaging) ; Dabrowski, Anne (CERN) ; Butler, Anthony P H (Otago U. ; CERN ; MARS Bioimaging ; Canterbury U.) ; Butler, Philip H (Otago U. ; CERN ; MARS Bioimaging ; Canterbury U.) ; Adebileje, Sikiru A (Otago U.) et al.
We describe a CMS-Medipix3RX neutron camera developed by adapting and modifying detector readout electronics developed at the University of Canterbury. The readout electronics are part of the MARS x-ray scanner used for imaging applications [1]. [...]
2019 - 6 p.
- Published in : 10.1109/NSSMIC.2018.8824390
In : 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2018), Sydney, Australia, 10 - 17 Nov 2018, pp.8824390
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Assessment of metal implant induced artefacts using photon counting spectral CT
/ Amma, Maya Rajeswari (Otago U.) ; Butler, Anthony P H (MARS Bioimaging ; Canterbury U. ; Otago U.) ; Raja, Aamir Y (Otago U.) ; Bamford, Benjamin (Otago U.) ; Butler, Philip (MARS Bioimaging ; Canterbury U. ; Otago U.) ; Walker, E Peter (Otago U.) ; Matanaghi, Aysouda (Otago U.) ; Adebileje, Sikiru A (Otago U. ; Canterbury U.) ; Anderson, Nigel (Otago U.) ; Anjomrouz, Marzieh (MARS Bioimaging) et al.
The aim is to perform qualitative and quantitative assessment of metal induced artefacts of small titanium biomaterials using photon counting spectral CT. The energy binning feature of some photon counting detectors enables the measured spectrum to be segmented into low, mid and high energy bins in a single exposure. [...]
2019 - 8 p.
- Published in : Proc. SPIE 11113 (2019) 111131D
In : Developments in X-Ray Tomography XII, San Diego, CA, United States, 11 - 15 Aug 2019, pp.111131D
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MARS pre-clinical imaging: the benefits of small pixels and good energy data
/ Butler, Philip H (MARS Bioimaging ; Canterbury U. ; Otago U.) ; Adebileje, Sikiru A (Otago U. ; Canterbury U.) ; Alexander, Steven D (MARS Bioimaging) ; Amma, Maya R (Otago U.) ; Amjomrouz, Marzieh (MARS Bioimaging) ; Asghariomabad, Fatemeh (Otago U.) ; Atharifard, Ali (MARS Bioimaging) ; Atlas, James (Canterbury U.) ; Bamford, Benjamin (Otago U.) ; Bell, Stephen T (MARS Bioimaging) et al.
Images from MARS spectral CT scanners show that there is much diagnostic value from using small pixels and good energy data. MARS scanners use energy-resolving photon-counting CZT Medipix3RX detectors that measure the energy of photons on a five-point scale and with a spatial resolution of 110 microns. [...]
2019
- Published in : Proc. SPIE 11113 (2019) 111130C
In : Developments in X-Ray Tomography XII, San Diego, CA, United States, 11 - 15 Aug 2019, pp.111130C
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Element-specific spectral imaging of multiple contrast agents: a phantom study
/ Panta, R K (U. Otago, Dept. Radiol. ; MARS Bioimaging) ; Bell, S T (MARS Bioimaging) ; Healy, J L (Canterbury U.) ; Aamir, R (U. Otago, Dept. Radiol. ; MARS Bioimaging) ; Bateman, C J (Lincoln University) ; Moghiseh, M (U. Otago, Dept. Radiol.) ; Butler, A P H (CERN ; U. Otago, Dept. Radiol. ; MARS Bioimaging ; Canterbury U.) ; Anderson, N G (U. Otago, Dept. Radiol.)
This work demonstrates the feasibility of simultaneous discrimination of multiple contrast agents based on their element-specific and energy-dependent X-ray attenuation properties using a pre-clinical photon-counting spectral CT. We used a photon-counting based pre-clinical spectral CT scanner with four energy thresholds to measure the X-ray attenuation properties of various concentrations of iodine (9, 18 and 36 mg/ml), gadolinium (2, 4 and 8 mg/ml) and gold (2, 4 and 8 mg/ml) based contrast agents, calcium chloride (140 and 280 mg/ml) and water. [...]
2018 - 17 p.
- Published in : JINST 13 (2018) T02001-T02001
Fulltext: PDF;
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Semi-analytic off-axis X-ray source model
/ Shamshad, M (U. Otago, Dept. Radiol.) ; Anjomrouz, M (U. Otago, Dept. Radiol.) ; Smithies, D J (MARS Bioimaging) ; Largeau, A (Telecom Phys., Strasbourg) ; Lu, G (Canterbury U.) ; Atharifard, A (U. Otago, Dept. Radiol.) ; Vanden Broeke, L (Canterbury U.) ; Aamir, R (U. Otago, Dept. Radiol. ; MARS Bioimaging) ; Panta, R K (U. Otago, Dept. Radiol. ; MARS Bioimaging) ; Walsh, M F (MARS Bioimaging) et al.
Spectral computed tomography (CT) systems are employed with energy-resolving photon counting detectors. Incorporation of a spectrally accurate x-ray beam model in image reconstruction helps to improve material identification and quantification by these systems. [...]
2017
- Published in : JINST 12 (2017) P10013
External link: Fulltext
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Per-pixel energy calibration of photon counting detectors
/ Atharifard, A (Otago U.) ; Healy, J L (Canterbury U.) ; Goulter, B P (MARS Center) ; Ramyar, M (Otago U.) ; Broeke, L Vanden (Canterbury U.) ; Walsh, M F ; Onyema, C C (Canterbury U.) ; Panta, R K (Otago U.) ; Aamir, R (Otago U.) ; Smithies, D J et al.
Energy resolving performance of spectral CT systems is influenced by the accuracy of the detector's energy calibration. Global energy calibration maps a given threshold to the average energy response of all pixels of the detector. [...]
2017 - 12 p.
- Published in : JINST 12 (2017) C03085
Fulltext: pdf - PDF; 10.1088_1748-0221_12_03_C03085 - PDF;
In : 18th International Workshop on Radiation Imaging Detectors, Barcelona, Spain, 03 - 07 Jul 2016, pp.C03085
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Oblique fluorescence in a MARS scanner with a CdTe-Medipix3RX
/ Broeke, L Vanden (Canterbury U.) ; Atharifard, A. (Unlisted, NZ) ; Goulter, B.P. (Unlisted, NZ) ; Healy, J.L. (Unlisted, NZ) ; Ramyar, M. (Unlisted, NZ) ; Panta, R.K. (Unlisted, NZ ; Unlisted, NZ) ; Anjomrouz, M. (Unlisted, NZ) ; Shamshad, M. (Unlisted, NZ) ; Largeau, A. (Telecom Phys., Strasbourg) ; Mueller, K. (Lubeck, Fachhochschule) et al.
The latest version of the MARS small bore scanner makes use of the Medipix3RX ASIC, bonded to a CdTe or CZT semi-conductor layer, to count x-ray photons and create a spectroscopic CT data set. The MARS imaging chain uses the energy-resolved 2D transmission images to construct quantitative 3D spectral and material images. [...]
2016
- Published in : JINST 11 (2016) C12063
IOP Open Access article: PDF;
In : 18th International Workshop on Radiation Imaging Detectors, Barcelona, Spain, 03 - 07 Jul 2016, pp.C12063
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10.
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Energy Calibration of the Pixels of Spectral X-ray Detectors
/ Panta, Raj Kumar (Otago U.) ; Walsh, Michael F (MARS Bioimaging Ltd., Christchurch) ; Bell, Stephen T (MARS Bioimaging Ltd., Christchurch) ; Anderson, Nigel G (Otago U.) ; Butler, Anthony P (Otago U. ; Canterbury U. ; CERN ; MARS Bioimaging Ltd., Christchurch) ; Butler, Philip H (Canterbury U. ; CERN ; MARS Bioimaging Ltd., Christchurch)
The energy information acquired using spectral X-ray detectors allows noninvasive identification and characterization of chemical components of a material. To achieve this, it is important that the energy response of the detector is calibrated. [...]
2015 - 10 p.
- Published in : IEEE Trans. Med. Imaging 34 (2015) 697-706
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