Variation kVp and mAs on CT scan image quality using standard phantom

Irsal, Muhammad; Nurbaiti,; Mukhtar, Aulia Narendra; Jauhari, Arif; Winarno, Guntur

doi:10.1063/5.0030320

Cited by 8 publications

(4 citation statements)

References 30 publications

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“…tube current, slice spacing, and slice thickness), it is important to point out that tube voltage never varied. Previous studies have shown that alterations in tube voltage have the most significant impact on HU [39,52]. Slightly higher errors were observed for subjects S11-S17 compared to other subjects in Group 2.…”

Section: Plos Onementioning

confidence: 74%

Phantomless calibration of CT scans for hip fracture risk prediction in silico: Comparison with phantom-based calibration

Szyszko,

Aldieri,

La Mattina

et al. 2024

PLoS ONE

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Finite element models built from quantitative computed tomography images rely on element-wise mapping of material properties starting from Hounsfield Units (HU), which can be converted into mineral densities upon calibration. While calibration is preferably carried out by scanning a phantom with known-density components, conducting phantom-based calibration may not always be possible. In such cases, a phantomless procedure, where the scanned subject’s tissues are used as a phantom, is an interesting alternative. The aim of this study was to compare a phantom-based and a phantomless calibration method on 41 postmenopausal women. The proposed phantomless calibration utilized air, adipose, and muscle tissues, with reference equivalent mineral density values of -797, -95, and 38 mg/cm3, extracted from a previously performed phantom-based calibration. A 9-slice volume of interest (VOI) centred between the femoral head and knee rotation centres was chosen. Reference HU values for air, adipose, and muscle tissues were extracted by identifying HU distribution peaks within the VOI, and patient-specific calibration was performed using linear regression. Comparison of FE models calibrated with the two methods showed average relative differences of 1.99% for Young’s modulus1.30% for tensile and 1.34% for compressive principal strains. Excellent correlations (R2 > 0.99) were identified for superficial maximum tensile and minimum compressive strains. Maximum normalised root mean square relative error (RMSRE) values settled at 4.02% for Young’s modulus, 2.99% for tensile, and 3.22% for compressive principal strains, respectively. The good agreement found between the two methods supports the adoption of the proposed methodology when phantomless calibration is needed.

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Section: Plos Onementioning

confidence: 74%

Phantomless calibration of CT scans for hip fracture risk prediction in silico: Comparison with phantom-based calibration

Szyszko,

Aldieri,

La Mattina

et al. 2024

PLoS ONE

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“…Changing the mA value changes the beam intensity directly and thus the number of x-rays proportionally, and it directly affected on image quality and absorbed dose. Acquisitions that deposit higher doses tend to result in lower image noise and better SNR and CNR (8,21) . The relationship between noise and mAs (number of photons) is inverse, so that as the tube current increases, the noise decreases (22) .…”

Section: Objective Image Quality Analysismentioning

confidence: 99%

Optimization of Lung Ct Protocol for the Diagnostic Evaluation of Covid-19 Lung Disease

Nasab

Deevband

Rahimi

et al. 2021

Radiation Protection Dosimetry

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This study intends to evaluate the different lung CT scan protocols used for the diagnostic evaluation of COVID-19-induced lung disease in Iranian imaging centers in terms of radiation dose and image quality. After data collecting, subjective image quality, radiation dose and objective image quality such as noise, SNR and CNR were assessed. Statistically significant differences in effective dose and image quality were evident among different lung CT protocols. Lowest and highest effective dose was1.31 ± 0.53 mSv related to a protocol with activated AEC (reference mAs = 20) and 6.15 ± 0.57 mSv related to a protocol with Fixed mAs (mAs = 100), respectively. A protocol with enabled tube current modulation with 70 mAs as a reference mAs, and protocol with 20 mAs and enabled AEC had the best and lowest image quality, respectively. To optimize the scan parameters, AEC must be used, and a range of tube currents (between 20 and 50 mAs) can produce acceptable images in terms of diagnostic quality and radiation dose for the diagnosis of COVID-19-induced lung disease.

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“…Menurunkan kilovolt (kVp) dan milliampere-second (mAs) sebagai metode yang efektif untuk mengurangi dosis radiasi dengan menjaga kualitas gambar agar tetap optimal. Pada penelitian oleh Irsal, 2020 penggunaan parameter kV dapat dioptimalkan untuk mengurangi dosis radiasi dan meningkatkan kualitas citra [19], penurunan dosis radiasi dengan menjaga kualitas gambar agar tetap optimal dengan menggunakan filter, reconstruction kernel dan iterative reconstruction [20]. sehingga peneliti tertarik untuk melakukan analisa pengaruh tegangan tabung terhadap penggunaan iterative reconstruction pada pemeriksaan CT kepala menggunakan pantom antrophomorphic sebagai pengganti pasien pengganti pasien pemeriksaan CT.…”

Section: Pendahuluanunclassified

Pengaruh Tegangan Tabung terhadap Kualitas Citra pada Pemeriksaan Computed Tomography Kepala menggunakan Iterative Reconstruction

Irsal

Nurbaiti

Mukhtar³

et al. 2021

J. Teori Apl. Fis.

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Iterative reconstruction can optimize radiation dose and improve image quality on CT scan. This research method is quantitative analytic with the analysis of the results of the head CT examination parameters associated with image quality to changes in variations of 80 kV, 100 kV, 120 kV with the use of iterative reconstruction. Image quality measurements are the Hounsfield Unit (HU) value, standard deviation, and Signal to Noise Ratio (SNR) using Radiant Viewers. Effective dose measurement using the Dose Length Product (DLP). Then perform the Kruskal Wallis test to find out whether there is an effect of tube voltage and Iterative Reconstruction on the SNR value using IBM SPSS version 24. The results image quality of the HU value increase due to changes in the kV value, but the value does not change significantly when the iDose changes, for the standard The deviation has decreased due to changes in kV, but the value of the value does not experience a significant change at the time of change in iDose, while SNR increases due to changes in kV value and changes in iDose. The percentage ratio of the effective dose in the use of standard kV with 80 kV decreased radiation dose by 62%, while at 100 kV there was a decrease of 25%, and the use of 120 kV experienced an increase of 25%. The results of the Kruskal Wallis test p-value <0.001, therefore it can be concluded that there is a difference in the SNR image quality at each change in iDose and kV parameters.

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Variation kVp and mAs on CT scan image quality using standard phantom

Cited by 8 publications

References 30 publications

Phantomless calibration of CT scans for hip fracture risk prediction in silico: Comparison with phantom-based calibration

Phantomless calibration of CT scans for hip fracture risk prediction in silico: Comparison with phantom-based calibration

Optimization of Lung Ct Protocol for the Diagnostic Evaluation of Covid-19 Lung Disease

Pengaruh Tegangan Tabung terhadap Kualitas Citra pada Pemeriksaan Computed Tomography Kepala menggunakan Iterative Reconstruction

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