High-spatial resolution measurements with a GaAs:Cr sensor using the charge integrating MONCH detector with a pixel pitch of 25μm

被引：5

作者：

Chiriotti, S. ^{[1
]}

Barten, R. ^{[1
]}

Bergamaschi, A. ^{[1
]}

Bruckner, M. ^{[1
]}

Carulla, M. ^{[1
]}

Chsherbakov, I ^{[2
]}

Dinapoli, R. ^{[1
]}

Frojdh, E. ^{[1
]}

Greiffenberg, D. ^{[1
]}

Hasanaj, S. ^{[1
]}

Hinger, V ^{[1
]}

King, T. ^{[1
]}

Kozlowski, P. ^{[1
]}

Lopez-Cuenca, C. ^{[1
]}

Lozinskaya, A. ^{[1
]}

Marone, F. ^{[2
]}

Mezza, D. ^{[1
]}

Moustakas, K. ^{[1
]}

Mozzanica, A. ^{[1
]}

Ruder, C. ^{[1
]}

Schmitt, B. ^{[1
]}

Thattil, D. ^{[1
]}

Tolbanov, O. ^{[2
]}

Tyazhev, A. ^{[2
]}

Zarubin, A. ^{[2
]}

Zhang, J. ^{[1
]}

机构：

[1] Paul Scherrer Inst PSI, Forschungsstr 111, CH-5232 Villigen, Switzerland

[2] Tomsk State Univ TSU, R&D Ctr Adv Elect Technol, Lenin Ave 36, RUS-634050 Tomsk, Russia

来源：

JOURNAL OF INSTRUMENTATION | 2022年 / 17卷 / 04期

关键词：

Hybrid detectors; Image processing; X-ray detectors; MICROMETER-RESOLUTION; GALLIUM-ARSENIDE;

D O I：

10.1088/1748-0221/17/04/P04007

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The aim of this project is to determine the imaging capabilities of a 25 mu m pixel pitch GaAs:Cr sensor of 500 mu m thickness bump-bonded to the charge integrating MONCH 03 readout chip (also called GaAs-MONCH assembly) and to assess the possibility to improve the spatial resolution by applying a position interpolation algorithm developed at PSI. Measurements were performed at the TOMCAT beamline of the Swiss Light Source (SLS) using photon beams in the energy range of 10-30 keV. The imaging experiments indicate the possibility to enhance the spatial resolution of the detector beyond its actual physical pixel pitch. We have quantified the spatial resolution of a GaAs-MONCH assembly by means of the modulation transfer function (MTF), achieving 10 mu m at 10 keV and 12 mu m at 20 keV photon energies. By applying a modified interpolation algorithm, a spatial resolution of similar to 5 mu m was obtained for 16 keV when binning to 2.5 mu m virtual pixels, while with the silicon-MONCH assembly, we achieved a spatial resolution of 3.5 mu m, which serves as gold standard. The results are promising because they open new possibilities to perform imaging measurements using the GaAs-MONCH assembly at photon energies above 15 keV, where silicon sensors suffer from a diminishing quantum efficiency.

引用

页数：18

共 12 条

[11] Absorbed Dose Rate Measurements Around a Single 192Ir Intravascular Brachytherapy Seed Using a High-Spatial Resolution Gel Dosimetry System
Massillon-Jl, G.
MEDICAL PHYSICS, 2011, 38 (06)
[12] HIGH-SPATIAL-RESOLUTION OH ROTATIONAL TEMPERATURE-MEASUREMENTS IN AN ATMOSPHERIC-PRESSURE FLAME USING AN INDIUM-BASED RESONANCE IONIZATION DETECTOR
PETRUCCI, GA
IMBROISI, D
GUENARD, RD
SMITH, BW
WINEFORDNER, JD
APPLIED SPECTROSCOPY, 1995, 49 (05) : 655 - 659

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