scholarly journals Synchrotron high energy X-ray methods coupled to phase sensitive analysis to characterize aging of solid catalysts with enhanced sensitivity

2013 ◽  
Vol 15 (22) ◽  
pp. 8629 ◽  
Author(s):  
Davide Ferri ◽  
Mark A. Newton ◽  
Marco Di Michiel ◽  
Songhak Yoon ◽  
Gian Luca Chiarello ◽  
...  
Keyword(s):  
High Energy ◽  
Sensitive Analysis ◽  
X Ray ◽  
Solid Catalysts ◽  
Enhanced Sensitivity ◽  
Phase Sensitive ◽  
Ray Methods

Development and Pre‐Clinical Evaluation of a Patient‐Specific High Energy X‐ray Phase Sensitive Breast Tomosynthesis System

2021 ◽  
Author(s):  
Muhammad U. Ghani ◽  
Xizeng Wu ◽  
Laurie L. Fajardo ◽  
Zhengxue Jing ◽  
Molly D. Wong ◽  
...  
Keyword(s):  
Clinical Evaluation ◽  
High Energy ◽  
Patient Specific ◽  
Breast Tomosynthesis ◽  
X Ray ◽  
Phase Sensitive

Evaluation and comparison of a CdTe based photon counting detector with an energy integrating detector for X-ray phase sensitive imaging of breast cancer

2021 ◽  
pp. 1-13
Author(s):  
Muhammad U. Ghani ◽  
Farid H. Omoumi ◽  
Xizeng Wu ◽  
Laurie L. Fajardo ◽  
Bin Zheng ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Spatial Resolution ◽  
Standard Dose ◽  
Photon Counting ◽  
High Energy ◽  
Edge Enhancement ◽  
X Ray ◽  
Photon Counting Detector ◽  
Phase Sensitive ◽  
Observer Studies

PURPOSE: To compare imaging performance of a cadmium telluride (CdTe) based photon counting detector (PCD) with a CMOS based energy integrating detector (EID) for potential phase sensitive imaging of breast cancer. METHODS: A high energy inline phase sensitive imaging prototype consisting of a microfocus X-ray source with geometric magnification of 2 was employed. The pixel pitch of the PCD was 55μm, while 50μm for EID. The spatial resolution was quantitatively and qualitatively assessed through modulation transfer function (MTF) and bar pattern images. The edge enhancement visibility was assessed by measuring edge enhancement index (EEI) using the acrylic edge acquired images. A contrast detail (CD) phantom was utilized to compare detectability of simulated tumors, while an American College of Radiology (ACR) accredited phantom for mammography was used to compare detection of simulated calcification clusters. A custom-built phantom was employed to compare detection of fibrous structures. The PCD images were acquired at equal, and 30% less mean glandular dose (MGD) levels as of EID images. Observer studies along with contrast to noise ratio (CNR) and signal to noise ratio (SNR) analyses were performed for comparison of two detection systems. RESULTS: MTF curves and bar pattern images revealed an improvement of about 40% in the cutoff resolution with the PCD. The excellent spatial resolution offered by PCD system complemented superior detection of the diffraction fringes at boundaries of the acrylic edge and resulted in an EEI value of 3.64 as compared to 1.44 produced with EID image. At MGD levels (standard dose), observer studies along with CNR and SNR analyses revealed a substantial improvement of PCD acquired images in detection of simulated tumors, calcification clusters, and fibrous structures. At 30% less MGD, PCD images preserved image quality to yield equivalent (slightly better) detection as compared to the standard dose EID images. CONCLUSION: CdTe-based PCDs are technically feasible to image breast abnormalities (low/high contrast structures) at low radiation dose levels using the high energy inline phase sensitive imaging technique.

scholarly journals Dose and detectability improvements with high energy phase sensitive x-ray imaging in comparison to low energy conventional imaging

2014 ◽  
Vol 59 (9) ◽  
pp. N37-N48 ◽  
Author(s):  
Molly Donovan Wong ◽  
Aimin Yan ◽  
Muhammad Ghani ◽  
Yuhua Li ◽  
Laurie Fajardo ◽  
...  
Keyword(s):  
High Energy ◽  
Low Energy ◽  
Conventional Imaging ◽  
X Ray ◽  
X Ray Imaging ◽  
Phase Sensitive

Formation of Substructure and Texture in Dual-Phase Steels due to Thermal Treatment

2010 ◽  
Vol 160 ◽  
pp. 147-152
Author(s):  
M. Masimov ◽  
Helmut Klein
Keyword(s):  
Synchrotron Radiation ◽  
Thermal Treatment ◽  
High Energy ◽  
Dual Phase ◽  
Texture Formation ◽  
X Ray ◽  
Dp Steels ◽  
Initial Texture ◽  
Bcc Phase ◽  
Ray Methods

Microstructure and texture formation in DP steels obtained by thermal treatment at temperatures of 780 °C i.e. between Ac1 and Ac3 and at 900 °C, i.e. above Ac3 and following different cooling techniques were studied by means of X-ray and electron diffraction techniques. The formation of the different structure constituents as well as substructure parameters such as blocks size and misorientation between them induced by thermal treatment was detailed analyzed. Various methods – conventional X-ray methods, high-energy synchrotron radiation and EBSD measuring – the texture of the bcc phase were applied in order to investigate their influence on the results. Beside texture heredity, a softening of the initial texture components induced by cold rolling and of related anisotropy of steels due to thermal treatment was estimated.

scholarly journals Low dose high energy x-ray in-line phase sensitive imaging prototype: Investigation of optimal geometric conditions and design parameters

2015 ◽  
Vol 23 (6) ◽  
pp. 667-682 ◽  
Author(s):  
Muhammad U. Ghani ◽  
Aimin Yan ◽  
Molly D. Wong ◽  
Yuhua Li ◽  
Liqiang Ren ◽  
...  
Keyword(s):  
Low Dose ◽  
High Energy ◽  
Design Parameters ◽  
X Ray ◽  
Geometric Conditions ◽  
Phase Sensitive

scholarly journals Technical Note: Synchrotron-based high-energy x-ray phase sensitive microtomography for biomedical research

2015 ◽  
Vol 42 (10) ◽  
pp. 5595-5603 ◽  
Author(s):  
Huiqiang Liu ◽  
Xizeng Wu ◽  
Tiqiao Xiao
Keyword(s):  
Biomedical Research ◽  
High Energy ◽  
Technical Note ◽  
X Ray ◽  
Phase Sensitive
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