scholarly journals CT image quality influence on different material Edge Response Functions for accurate metrological applications

2021 ◽  
Vol 1193 (1) ◽  
pp. 012064
Author(s):  
I Holgado ◽  
J Iglesias ◽  
N Ortega ◽  
S Plaza ◽  
A Pascual
Keyword(s):  
Image Quality ◽  
Spot Size ◽  
Ct Measurements ◽  
Aluminium Copper ◽  
Measurement Results ◽  
X Ray Computed ◽  
Ct Image Quality ◽  
The Relationship ◽  
Ct Measurement ◽  
Edge Response

Abstract The main objective of the proposed work was to analyse the influence of magnification and focal spot size scan settings on X-ray computed tomography (CT) measurements results under commercial threshold-based algorithms. The relationship between spatial resolution and contrast sensitivity in CT scans of different materials and the accuracy of the resulting CT measurement results is discussed. For that purpose, Aluminium, Copper, Inconel 718 and Titanium disk phantoms were scanned. Preliminary measurements showed that deviations can increase up to 0.48% when the scanning magnification was increased while, for a given magnification, the decrease of a focus size from 1mm to 0.4mm slightly improves the differences up to 0.15%, being negligible at low magnifications. Unsharpness (U T ) and contrast-to-noise ratio (CNR) were calculated for each scanning conditions according to standard ASTM E1695 – 20. A new image quality indicator that includes the combined effect of the U T and CNR was proposed in order to relate measurement error with the image quality. The indicator proves that the influence of CNR is much higher than influence of U T on the CT measurements.

scholarly journals Comparison between NEMA NU-2 and the new report of AAPM TG 126 for PET-CT image quality

2021 ◽  
Author(s):  
Eugenio Galicia-Larios ◽  
Carlos Alberto Reynoso-Mejía
Keyword(s):  
Image Quality ◽  
Ct Image ◽  
Pet Ct ◽  
Ct Image Quality

scholarly journals Adaptive Iterative Dose Reduction Using Three Dimensional Processing (AIDR3D) Improves Chest CT Image Quality and Reduces Radiation Exposure

PLoS ONE ◽  
2014 ◽  
Vol 9 (8) ◽  
pp. e105735 ◽  
Author(s):  
Tsuneo Yamashiro ◽  
Tetsuhiro Miyara ◽  
Osamu Honda ◽  
Hisashi Kamiya ◽  
Kiyoshi Murata ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Exposure ◽  
Dose Reduction ◽  
Three Dimensional ◽  
Chest Ct ◽  
Ct Image ◽  
Ct Image Quality ◽  
Dimensional Processing

Automating routine CT image quality analysis from a virtual server

2018 ◽  
Vol 52 ◽  
pp. 166
Author(s):  
Patrick Monnelly ◽  
John Cronin ◽  
Peter Woulfe
Keyword(s):  
Image Quality ◽  
Quality Analysis ◽  
Ct Image ◽  
Image Quality Analysis ◽  
Ct Image Quality

Optimization of PET/CT image quality using the GE ‘Sharp IR’ point-spread function reconstruction algorithm

2017 ◽  
Vol 38 (6) ◽  
pp. 471-479 ◽  
Author(s):  
Nicholas J. Vennart ◽  
Nicholas Bird ◽  
John Buscombe ◽  
Heok K. Cheow ◽  
Ewa Nowosinska ◽  
...  
Keyword(s):  
Image Quality ◽  
Point Spread Function ◽  
Reconstruction Algorithm ◽  
Ct Image ◽  
Point Spread ◽  
Pet Ct ◽  
Spread Function ◽  
Ct Image Quality ◽  
Function Reconstruction

scholarly journals Use of a channelized Hotelling observer to assess CT image quality and optimize dose reduction for iteratively reconstructed images

2017 ◽  
Vol 4 (03) ◽  
pp. 1 ◽  
Author(s):  
Christopher P. Favazza ◽  
Andrea Ferrero ◽  
Lifeng Yu ◽  
Shuai Leng ◽  
Kyle L. McMillan
Keyword(s):  
Image Quality ◽  
Dose Reduction ◽  
Ct Image ◽  
Hotelling Observer ◽  
Ct Image Quality ◽  
Channelized Hotelling Observer

scholarly journals RFID-Based Microwave Biosensor for Non-Contact Detection of Glucose Solution

Biosensors ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 480
Author(s):  
Minjia Gao ◽  
Tian Qiang ◽  
Yangchuan Ma ◽  
Junge Liang ◽  
Yanfeng Jiang
Keyword(s):  
Glucose Solution ◽  
Linear Regression Analysis ◽  
Split Ring Resonator ◽  
Diabetic Patients ◽  
Response Measurement ◽  
Contact Measurement ◽  
Complementary Split Ring Resonator ◽  
Glucose Levels ◽  
Measurement Results ◽  
The Relationship

Due to the increasing number of diabetic patients, early monitoring of glucose levels is particularly important; therefore, glucose biosensors have attracted enormous attention from researchers. In this paper, we propose a glucose microwave biosensor based on RFID and achieve a non-contact measurement of the concentration of glucose solutions. The Reader is a complementary split-ring resonator (CSRR), and the Tag is comprised of a squared spiral capacitor (SSC). A polydimethylsiloxane microfluidic quantitative cavity with a volume of 1.56 μL is integrated on the Tag to ensure that the glucose solution can be accurately set to the sensitive area and fully contacted with the electromagnetic flux. Because the SSC exhibits different capacitances when it contacts glucose solutions of different concentrations, changing the resonant frequency of the CSRR, we can use the relationship to characterize the biosensing response. Measurement results show that bare CSRR and RFID-based biosensors have achieved sensitivities of 0.31 MHz/mg·dL−1 and 10.27 kHz/mg·dL−1, and detection limits of 13.79 mg/dL and 1.19 mg/dL, respectively, and both realize a response time of less than 1 s. Linear regression analysis of the abovementioned biosensors showed an excellent linear relationship. The proposed design provides a feasible solution for microwave biosensors aiming for the non-contact measurement of glucose concentration.

scholarly journals PEMANFAATAN APLIKASI SMARTPHONE UNTUK MENGUKUR KEMANTAPAN PERMUKAAN JALAN BERDASARKAN INTERNATIONAL ROUGHNESS INDEX

2020 ◽  
Vol 19 (3) ◽  
pp. 205-214
Author(s):  
Arief Setiawan ◽  
Novita Pradani ◽  
Ferra Claudia Masoso
Keyword(s):  
Segment Length ◽  
Android Application ◽  
Smartphone Applications ◽  
International Roughness Index ◽  
Surface Conditions ◽  
Software Applications ◽  
Measurement Results ◽  
Roughness Index ◽  
Technological Developments ◽  
The Relationship

Abstract An assessment of road surface conditions is needed to determine an appropriate road evaluation program. One of the parameters used is the International Roughness Index or IRI. Currently, technological developments encourage the use of smartphone applications as a tool to determine the value of IRI. Comparisons between IRIs obtained using tools, such as roughometers, and IRIs obtained from software applications have not been made. The purpose of this study was to analyze the relationship between the results of the measurement of the roughometer and the results of the Android application Roadbump Pro. This research was carried out on the Sam Ratulangi Road in Palu City, with a segment length of 600 meters and analyzed per 100 meters. The results of this study indicate that smartphone applications provide good IRI measurement results, so they can be used in road stability assessments. In addition, the type of survey vehicle did not have a significant effect on IRI measurements. Keywords: smartphone, International Roughness Index, roughometer, Roadbump, road stability  Abstrak Penilaian kondisi permukaan jalan diperlukan untuk menentukan program evaluasi jalan yang tepat. Salah satu parameter yang digunakan adalah International Roughness Index atau IRI. Saat ini, perkembangan teknologi mendorong penggunaan aplikasi smartphone sebagai alat bantu untuk menentukan nilai IRI. Perbandingan antara IRI yang diperoleh dengan menggunakan alat bantu, seperti roughometer, dan IRI yang diperoleh dari aplikasi perangkat lunak belum dilakukan. Tujuan penelitian ini adalah menganalisis hubungan antara hasil pengukuran alat roughometer dan hasil aplikasi android Roadbump Pro. Penelitian ini dilakukan di ruas Jalan Sam Ratulangi di Kota Palu, dengan panjang segmen 600 meter dan dianalisis per 100 meter. Hasil penelitian ini menunjukkan bahwa aplikasi smartphone memberikan hasil pengukuran IRI yang baik, sehingga dapat digunakan dalam penilaian kemantapan jalan. Selain itu, jenis kendaraan survei tidak memberikan pengaruh yang signifikan terhadap pengukuran IRI. Kata-kata kunci: smartphone, International Roughness Index, roughometer, Roadbump, kemantapan jalan

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