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Construction of precision sMDT detector for the ATLAS Muon Spectrometer upgrade
/ Amidei, D. (Michigan U., MCTP ; Syracuse U.) ; Anderson, N. (Michigan U., MCTP ; Syracuse U.) ; Chen, A. (Michigan U., MCTP ; Syracuse U.) ; Carpenter, E. (Michigan U., MCTP ; Syracuse U.) ; Cooperrider, L. (Michigan U., MCTP ; Syracuse U.) ; Dai, T. (Michigan U., MCTP ; Syracuse U.) ; Diehl, E. (Michigan U., MCTP ; Syracuse U.) ; Ferretti, C. (Michigan U., MCTP ; Syracuse U.) ; Guo, Y. (Michigan U., MCTP ; Syracuse U.) ; Li, J. (Michigan U., MCTP ; Syracuse U. ; Shanghai Jiao Tong U.) et al.
This paper describes the small-diameter monitored drift-tube detector construction at the University of Michigan as a contribution to the ATLAS Muon Spectrometer upgrade for the high-luminosity Large Hadron Collider at CERN. Measurements of the first 30 chambers built at Michigan show that the drift tube wire position accuracy meets the specification of 20 microns. [...]
arXiv:2211.00714.-
2023-01-31 - 35 p.
- Published in : JINST 18 (2023) P01041
Fulltext: PDF;
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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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4.
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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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5.
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MARS-MD: rejection based image domain material decomposition
/ Bateman, C.J. (MARS Bioimaging ; U. Otago, Dept. Radiol. ; Canterbury U. ; Lincoln Agritech Limited, New Zealand) ; Knight, D. (U. Otago, Dept. Radiol.) ; Brandwacht, B. (Twente U., Enschede) ; Mahon, J., MC (Canterbury U.) ; Healy, J. (U. Canterbury, Dept. Biol.) ; Panta, R. (U. Otago, Dept. Radiol. ; MARS Bioimaging) ; Aamir, R. (U. Otago, Dept. Radiol.) ; Rajendran, K. (U. Otago, Dept. Radiol.) ; Moghiseh, M. (U. Otago, Dept. Radiol.) ; Ramyar, M. (U. Otago, Dept. Radiol.) et al.
This paper outlines image domain material decomposition algorithms that have been routinely used in MARS spectral CT systems. These algorithms (known collectively as MARS-MD) are based on a pragmatic heuristic for solving the under-determined problem where there are more materials than energy bins. [...]
arXiv:1802.05366.-
2018-03-16
- Published in : JINST 13 (2018) P05020-P05020
Preprint: arXiv:1802.05366 - PDF; 10.1088.1748-0221.13.05.P05020 - PDF;
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6.
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Quantitative imaging of excised osteoarthritic cartilage using spectral CT
/ Rajendran, Kishore (Otago U.) ; Löbker, Caroline (Otago U.) ; Schon, Benjamin S (Twente U., Enschede) ; Bateman, Christopher J (Otago U.) ; Younis, Raja Aamir (Otago U.) ; de Ruiter, Niels J A (Otago U.) ; Chernoglazov, Alex I (Canterbury U.) ; Ramyar, Mohsen (Otago U.) ; Hooper, Gary J (Otago U.) ; Butler, Anthony P H (Otago U. ; CERN ; MARS Bioimaging, New Zealand) et al.
Objectives:
To quantify iodine uptake in articular cartilage as a marker of glycosaminoglycan (GAG) content using multi-energy spectral CT.
Methods:
We incubated a 25-mm strip of excised osteoarthritic human tibial plateau in 50 % ionic iodine contrast and imaged it using a small-animal spectral scanner with a cadmium telluride photon-processing detector to quantify the iodine through the thickness of the articular cartilage. We imaged both spectroscopic phantoms and osteoarthritic tibial plateau samples. [...]
2017 - 9 p.
- Published in : Eur. Radiol. 27 (2017) 384-392
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7.
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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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8.
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9.
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Reducing beam hardening effects and metal artefacts using Medipix3RX: With applications from biomaterial science
/ Rajendran, K. ; Walsh, M.F. ; de Ruiter, N.J.A. ; Chernoglazov, A.I. ; Panta, R.K. ; Butler, A.P.H. ; Butler, P.H. ; Bell, S.T. ; Anderson, N.G. ; Woodfield, T.B.F. et al.
This paper discusses methods for reducing beam hardening effects using spectral data for biomaterial applications. A small-animal spectral scanner operating in the diagnostic energy range was used. [...]
arXiv:1311.5303.-
2014-03-26 - 11 p.
- Published in : JINST 9 (2014) P03015
Preprint: PDF; External link: Preprint
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10.
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MARS spectral molecular imaging of lamb tissue: data collection and image analysis
/ Aamir, R. (Otago U.) ; Chernoglazov, A. (Canterbury U.) ; Bateman, C.J. (Otago U.) ; Butler, A.P.H. (Otago U. ; CERN ; Canterbury U.) ; Butler, P.H. (CERN ; Canterbury U.) ; Anderson, N.G. (Otago U.) ; Bell, S.T. (Unlisted, NZ) ; Panta, R.K. (Otago U.) ; Healy, J.L. (Canterbury U.) ; Mohr, J.L. (Otago U.) et al.
Spectral molecular imaging is a new imaging technique able to discriminate and quantify different components of tissue simultaneously at high spatial and high energy resolution. Our MARS scanner is an x-ray based small animal CT system designed to be used in the diagnostic energy range (20 to 140 keV). [...]
arXiv:1311.4528.-
2014-02-17 - 11 p.
- Published in : JINST 9 (2014) P02005
Fulltext: PDF; IOP Open Access article: PDF; External link: Preprint
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