Results 161 to 170 of about 5,341 (200)
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SU-FF-I-28: A Critical Look at the Numerical Coefficients in CTDIVOL
Medical Physics, 2006Purpose: To critically examine the assumptions leading to the formula for CTDIVOL, which uses measured CTDI values at the center and periphery to estimate the overall average dose to a homogeneous cylindrical phantom. Method and Materials: CTDIVOL is a widely used figure of merit that estimates the average dose delivered by a CT scan to standard ...
exaly +2 more sources
Pengaruh Tegangan terhadap Nilai CTDIvol, Dose Length Product dan Dosis Efektif pada Pemeriksaan Computed Tomography (CT) Abdomen: Studi di Rumah Sakit Umum Pusat Dr. M. Djamil [PDF]
Jurnal Fisika Unand, 2023 Penelitian ini bertujuan untuk menginvestigasi dampak variasi tegangan pada dosis radiasi yang diterima oleh pasien yang menjalani pemeriksaan Computed Tomography (CT) abdomen menggunakan mesin pemindai Philips 128 slice.
Sri Oktamuliani
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SU‐FF‐I‐36: Comparison of Vendor Estimated CTDIvol and Physicist Calculated CTDIvol
Medical Physics, 2009Purpose: To determine if CT unit's estimated CTDIvol is statistically similar to values obtained using conventional medical physics testing and instrumentation. The ACR calculation spreadsheet was used to calculate the CTDIvol for each unit tested. Method and Materials: Exposure measurements were obtained from the center and 12 o'clock position for ...
P Johnson, K Stenroos, W Davros
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Modelling variations in CTDIvol data due to patient miscentring in Bayer Radimetrics™ data
Physica Medica, 2016It has previously been established that incorrect centring of patients in CT imaging, identified as a significant difference between the patient centroid and CT scanner isocentre, may lead to poorly optimised operation of the automatic exposure control (AEC).
Michael Rowan +3 more
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SU‐G‐206‐11: The Effect of Table Height On CTDIvol and SSDE in CT Scanning: A Phantom Study
Medical Physics, 2016Purpose:Localizer projection radiographs acquired prior to CT scans are used to estimate patient size, affecting the function of Automatic Tube Current Modulation (ATCM) and calculation of the Size Specific Dose Estimate (SSDE). Due to geometric effects, the projected patient size varies with scanner table height and with the orientation of the ...
R Marsh, M Silosky
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European Journal of Radiology, 2014
OBJECTIVES In this phantom CT study, we investigated whether images reconstructed using filtered back projection (FBP) and iterative reconstruction (IR) with reduced tube voltage and current have equivalent quality. We evaluated the effects of different acquisition and reconstruction parameter settings on image quality and radiation doses. Additionally,
Klink, Thorsten +5 more
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OBJECTIVES In this phantom CT study, we investigated whether images reconstructed using filtered back projection (FBP) and iterative reconstruction (IR) with reduced tube voltage and current have equivalent quality. We evaluated the effects of different acquisition and reconstruction parameter settings on image quality and radiation doses. Additionally,
Klink, Thorsten +5 more
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ESTIMASI NILAI DOSIS PADA PEMERIKSAAN CT SCAN KEPALA DEWASA BERDASARKAN NILAI CTDIvol DAN DLP
JRI (Jurnal Radiografer Indonesia), 2022ABSTRACT Background: Estimating the exact dose in CT Scan patients can be done by referring to an optimization index called DRL (Diagnostic Reference Level). Currently, the DRL for CT-Scans is expressed in CTDIvol (Computed Tomography Dose Index Volume) and DLP (Dose Length Product).
Ni Nyoman Sri Wikanadi +2 more
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Radiation Protection Dosimetry, 2023
Abstract Lung lesions can increase the CT number and affect the water-equivalent diameter (Dw), Dw-based conversion factor (CFw), and Dw-based size-specific dose estimate (SSDEw). We evaluated the effect of COVID-19 lesions and total severity score (TSS) on radiation dose considering the effect of automatic tube current modulation (ATCM)
Ahmad Mohammadbeigi +9 more
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Abstract Lung lesions can increase the CT number and affect the water-equivalent diameter (Dw), Dw-based conversion factor (CFw), and Dw-based size-specific dose estimate (SSDEw). We evaluated the effect of COVID-19 lesions and total severity score (TSS) on radiation dose considering the effect of automatic tube current modulation (ATCM)
Ahmad Mohammadbeigi +9 more
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Radiation Protection Dosimetry
Abstract Despite neonatal radiosensitivity, accurate lens dose assessments in computed tomography (CT) are lacking. We assessed the neonatal head CT eye lens dose under various scanning conditions, including vertical table displacement and organ-based exposure modulation (OEM), using the GAFCHROMIC LD-V1 (LD-V1), which can measure two-
Tatsuhiro Gotanda +9 more
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Abstract Despite neonatal radiosensitivity, accurate lens dose assessments in computed tomography (CT) are lacking. We assessed the neonatal head CT eye lens dose under various scanning conditions, including vertical table displacement and organ-based exposure modulation (OEM), using the GAFCHROMIC LD-V1 (LD-V1), which can measure two-
Tatsuhiro Gotanda +9 more
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SU-C-12A-02: CTDIvol Variability in Tube-Current Modulated Body CT: The Role of Patient Diameter
Medical Physics, 2014Purpose: Researchers have used the large variability in CTDIvol as an example of inconsistent and inappropriate protocols for CT imaging. However, CTDIvol variability can exist for many sound reasons pertaining to protocol needs (slice thickness, etc.) or patient size.
J Boone, J Seibert
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