scholarly journals An algorithm for automated modulation transfer function measurement using an edge of a PMMA phantom: Impact of field of view on spatial resolution of CT images

2018 ◽  
Vol 19 (6) ◽  
pp. 244-252 ◽  
Author(s):  
Choirul Anam ◽  
Toshioh Fujibuchi ◽  
Wahyu Setia Budi ◽  
Freddy Haryanto ◽  
Geoff Dougherty
Keyword(s):  
Transfer Function ◽  
Spatial Resolution ◽  
Modulation Transfer Function ◽  
Ct Images ◽  
Field Of View ◽  
Modulation Transfer ◽  
Function Measurement

Modulation transfer function measurement of CT images by use of a circular edge method with a logistic curve-fitting technique

2014 ◽  
Vol 8 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Tomomi Takenaga ◽  
Shigehiko Katsuragawa ◽  
Makoto Goto ◽  
Masahiro Hatemura ◽  
Yoshikazu Uchiyama ◽  
...  
Keyword(s):  
Transfer Function ◽  
Curve Fitting ◽  
Modulation Transfer Function ◽  
Ct Images ◽  
Modulation Transfer ◽  
Logistic Curve ◽  
Function Measurement ◽  
Edge Method

scholarly journals Modulation transfer function evaluation of cone beam computed and microcomputed tomography by using slanted edge phantom

2019 ◽  
Author(s):  
Szabó TAMÁS BENCE
Keyword(s):  
Transfer Function ◽  
Spatial Resolution ◽  
Modulation Transfer Function ◽  
Imaging System ◽  
Ct Images ◽  
Function Evaluation ◽  
Strong Positive Correlation ◽  
Micro Ct ◽  
Modulation Transfer ◽  
Voxel Size

Modulation transfer function (MTF) is a well known and widely accepted method for evaluating the spatial resolution of a digital radiographic imaging system. In the present study our aim was to evaluate the MTF obtained from CBCT and micro-CT images. A cylinder shaped phantom designed for slanted-edge method was scanned by a CBCT device at a 100 µm isometric voxel size and by a micro-CT device at a 20 µm isometric voxel size, simultaneously. The MTF curves were calculated and the mean spatial resolutions at 10% MTF were 3.33 + 0.29 lp/mm in the case of CBCT images and 13.35 + 2.47 lp/mm in the case of micro-CT images. The values showed a strong positive correlation regarding the CBCT and the micro-CT spatial resolution values, respectively. Our results suggests that CBCT imaging devices with a voxel size of 100 µm or below might aid the validation of fine anatomical structures and allowing the opportunity for reliable micromorphometric examinations

scholarly journals Comparison of MTF Measurement Methods in CT Images for Various Reconstruction Kernels

2021 ◽  
pp. 396-405
Author(s):  
Fakhri Ramadhani Arisyi ◽  
Choirul Anam ◽  
Catur Edi Widodo
Keyword(s):  
Transfer Function ◽  
Spatial Resolution ◽  
Modulation Transfer Function ◽  
Copper Wire ◽  
Ct Images ◽  
Measurement Methods ◽  
Point Method ◽  
Modulation Transfer ◽  
Circular Object

This study aimed to compare several methods of measuring the modulation transfer function (MTF) for different reconstruction kernels, using a point phantom, a small-circular (S-circular) Teflon object, and the automated edge of a PMMA phantom. The copper wire section of a phantom was used for the point method. The small-circular (S-circular) teflon object within the HU linearity section was used for measuring MTF using ImQuest software. The automated edge of a PMMA phantom was used to automatically measure the MTF. The three methods were implemented in images reconstructed with ten different kernels. It was found that the three methods produced comparable MTFs for all the kernels used. However, the automated edge of the PMMA phantom produced slightly smaller spatial resolutions compared with the two other methods. The differences between the automated edge of PMMA and the point method were small, i.e. 0.04 cycle/mm for both 10% MTF and 50% MTF. The differences between the automated edge of PMMA and the S-circular phantom were 0.05 cycle/mm and 0.03 cycle/mm for 10% MTF and 50% MTF. We found that the “UA” kernel produced the lowest spatial resolution values of 0.32, 0.33, and 0.31 cycle/mm of 50% MTF for point, S-circular object, and automated edge PMMA, respectively. The “YD” produced the highest spatial resolution values of 0.78, 0.76, and 0.67 cycle/mm of 10% MTF for point, S-circular object, and automated edge PMMA, respectively. We successfully compared three methods of MTF measurement. The three methods produce comparable MTFs, so that each method can be used for accurately measuring MTF depending on phantom and software available in the CT center.

Modulation transfer function measurement of IR optics at extreme temperatures

2003 ◽  
Author(s):  
Mikael Lindgren ◽  
Peter Ljungberg ◽  
Kjell Nilsson ◽  
Ralf G. Kihlen
Keyword(s):  
Transfer Function ◽  
Modulation Transfer Function ◽  
Extreme Temperatures ◽  
Modulation Transfer ◽  
Function Measurement

scholarly journals Sensor modulation transfer function measurement using band-limited laser speckle

2008 ◽  
Vol 16 (24) ◽  
pp. 20047 ◽  
Author(s):  
Xi Chen ◽  
Nicholas George ◽  
Gennadiy Agranov ◽  
Changmeng Liu ◽  
Bob Gravelle
Keyword(s):  
Transfer Function ◽  
Modulation Transfer Function ◽  
Laser Speckle ◽  
Modulation Transfer ◽  
Function Measurement ◽  
Band Limited

Modulation Transfer Function Measurement of Electron Multiplying CCD

2008 ◽  
Vol 28 (9) ◽  
pp. 1710-1716 ◽  
Author(s):  
冯志伟 Feng Zhiwei ◽  
程灏波 Cheng Haobo ◽  
宋谦 Song Qian ◽  
尚媛园 Shang Yuanyuan
Keyword(s):  
Transfer Function ◽  
Modulation Transfer Function ◽  
Modulation Transfer ◽  
Function Measurement

On-Orbit Modulation Transfer Function Measurement of Medium Resolution Spectral Imager

2016 ◽  
Vol 36 (4) ◽  
pp. 0428002
Author(s):  
郭玲玲 Guo Lingling ◽  
吴泽鹏 Wu Zepeng ◽  
赵其昌 Zhao Qichang ◽  
马文佳 Ma Wenjia ◽  
杨勇 Yang Yong
Keyword(s):  
Transfer Function ◽  
Modulation Transfer Function ◽  
Modulation Transfer ◽  
Function Measurement ◽  
Medium Resolution ◽  
Spectral Imager
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