Results 1 to 10 of about 6,218,792 (246)

Computed Dosimeter Dose Index on a 16-Slice Computed Tomography Scanner

Dose-Response, 2022
A computed tomography dose index can be used to quantify the radiation dose received during a CT scan and it is an indicator of the radiation dose to the polymetaylenmetaAcrylate (PMMA) standardized phantom. The objective of this study was 2-fold.
Tadelech S. Mekonin, Tilahun T. Deressu
doaj   +4 more sources

Application of computed tomography dose index as dosimetric parameter in dental tomography [PDF]

RGO: Revista Gaúcha de Odontologia, 2021
Objective Quantify the CTDI from a reference beam, correcting this value for several beam widths from the ratio of CTDI100 values measured in the air, and verifying the underestimation of the dose comparing CTDI100 and CTDI300, applied to dental CBCT ...
Rodrigo Antonio Pereira MAURO, Alessandro Martins da COSTA   +1 more
doaj   +4 more sources

Computed Tomography Dose Index Measurements in Wide-beam Computed Tomography System

Journal of Medical Physics
Computed tomography (CT) produces cross-sectional images for medical diagnosis; however, in wide cone-beam CT, conventional CT dose index (CTDI) measurements using a 100-mm ionization chamber (IC) underestimate dose for larger beam widths.
Sawwanee Asavaphatiboon, Suwadee Payomthip, Prapa Sodkokkruad, Wichan Prasertsilpakul, Tossaporn Iamsuk, Saifhon Ardmontree, Puangpen Tangboonduangjit   +6 more
doaj   +2 more sources

Evaluation of the Relationship Between Phantom Position and Computed Tomography Dose Index in Cone Beam Computed Tomography When Assuming Breast Irradiation [PDF]

Journal of Applied Clinical Medical Physics, 2021
AbstractThis study aims to investigate the influence of the phantom position on weighted computed tomography dose index (CTDIw) in cone beam computed tomography (CBCT) when assuming breast irradiation. Computed tomography dose index (CTDI) was measured by the x‐ray volume imaging of CBCT using parameters for image‐guided radiation therapy (IGRT) in ...
Akihiro Takemura, Hiroyuki Ueno, Kosuke Matsubara   +2 more
exaly   +3 more sources

Estimation of weighted computed tomography dose index (CTDIw) in megavoltage computed tomography (MVCT)

The Egyptian Journal of Radiology and Nuclear Medicine
Introduction Advanced technologies in radiation treatment deliveries require high accuracy and precision in setup before treatment to get accurate dose delivery for planned target volumes.
Rama Devi, Balbir Singh, Deepak Basandrai, Kamlesh Passi, Vikram Singh   +4 more
doaj   +2 more sources

Comparison of computed tomography dose index in polymethyl methacrylate and nylon dosimetry phantoms

Journal of Medical Physics, 2016
The use of computed tomography (CT) scanning has been growing steadily. Therefore, CT dose measurement is becoming increasingly important for patient protection and optimization. A phantom is an important tool for dose measurement.
Supawitoo Sookpeng, Patsuree Cheebsumon, Thanyawee Pengpan, Colin Martin   +3 more
doaj   +3 more sources

Automated calculation of slice-specific volume computed tomography dose index, water-equivalent diameter, and size-specific dose estimation for computed tomography scans

Diagnostic and Interventional Radiology
PURPOSE: To develop and validate an automated computational tool for calculating a slice-specific volume computed tomography (CT) dose index (CTDIvol), a water-equivalent diameter (Dw), and size-specific dose estimates (SSDEs) from CT images, addressing ...
Supawitoo Sookpeng, Rosario Lopez-Gonzalez, Suwapim Chanlaor, Boriphat Kadman   +3 more
doaj   +3 more sources

Estimation of absorbed dose of the thyroid gland in patients undergoing 64-slice head computed tomography and comparison the results with ImPACT software and computed tomography scan dose index

Journal of Medical Signals and Sensors, 2019
Thyroid exposure to radiation in brain computed tomography (CT) scan is of great value since it is considered as a vital organ. This study aimed to investigate the absorbed dose of thyroid by various protocols of head CT in patients referring to 64-slice
Asghar Maziar, Reza Paydar, Ghazal Azadbakht, Daryoush Shahbazi-Gahrouei   +3 more
doaj   +3 more sources

Using body mass index to estimate individualised patient radiation dose in abdominal computed tomography

European Radiology Experimental, 2018
Background The size-specific dose estimate (SSDE) is a dose-related metrics that incorporates patient size into its calculation. It is usually derived from the volume computed tomography dose index (CTDIvol) by applying a conversion factor determined ...
Siobhan O’Neill, Richard G. Kavanagh, Brian W. Carey, Niamh Moore, Michael Maher, Owen J. O’Connor   +5 more
doaj   +3 more sources

Evaluation of Local Diagnostic Reference Levels for Paediatric and Adult Patients Undergoing Head Computed Tomography Examination in Amhara Regional States, Ethiopia [PDF]

Iranian Journal of Medical Physics, 2023
Introduction: During computed tomography examinations variation of dose for pediatric and adults has been increasing widely, even when automated exposure control is used. Hence, the objective of this study was to assess the computed tomography head local
Seife Dellie, Ambaye Tesfaw
doaj   +1 more source