scholarly journals Estimation of Exposure Dose on MDCT Examination -The Measurement of Organ Dose and Effective Dose by Anthropomorphic Phantom-

2010 ◽  
Vol 66 (8) ◽  
pp. 901-910 ◽  
Author(s):  
Takumi Hirata ◽  
Kenji Inoue ◽  
Shinji Shigemori ◽  
Michitaka Matsuzaki, ◽  
Kouji Inatomi
Keyword(s):  
Effective Dose ◽  
Organ Dose ◽  
Exposure Dose ◽  
Anthropomorphic Phantom ◽  
Mdct Examination

scholarly journals Prediction of Organ and Effective dose with known mAs and kVp for Dose Optimisation Protocol and Recommendations in CT

2017 ◽  
pp. 216-222
Author(s):  
Issahaku Shirazu ◽  
Y. B. Mensah ◽  
Cyril Schandorf ◽  
S. Y. Mensah ◽  
Theophilus Sackey ◽  
...  
Keyword(s):  
Ct Scan ◽  
Effective Dose ◽  
Image Data ◽  
Organ Dose ◽  
Exposure Dose ◽  
Pitch Factor ◽  
Dose Length Product ◽  
Modeling Process ◽  
Clinical Recommendation ◽  
Dose Management

In medical exposure dose to patients are determine by input parameters including mAs, kVp, pitch factor among other factors. The aim of this study is to provide procedure and protocol of how to assess patients’ dose (organ and effective dose) estimates with preset eff mAs and standard kVp. This is to determine a tradeoff between patient’s dose and the image quality before imaging. In addition to providing appropriate clinical recommendation for clinicians for dose management during CT scan. MVL DICOM application software was used to access image data during abdominal CT scan. Organ and effective dose estimates were estimated as developed by ICRP 103 recommendations. Where on the image data, using MVL platform detail information of the mAs, kVp, CTDI<sup>vol</sup> and DLP were available for recording. <span style="background:white">The weighted CTDI (CTDI<sup>W</sup>) was estimated by multiplying the volume CTDI (CTDI<sup>VOL</sup>) by the pitch factor. Which was used to estimate organ dose using </span>the normalized organ dose factor <span style="background:white">and the effective dose was estimated by</span> the product of the region-specific normalizing constant and the dose length product.<span style="background:white"> The </span>mAs is the effective Milliameter per second, which were calculated by dividing the mAs by the pitch factor. The relationship between input and output parameters were modeled as the final component of the modeling process in a form of GUI applications format. This was done to establish the various process and procedures involve in abdominal scan for dose managements. The coding process involve the use of written visual basic code to design an interface and integrated on the MVL application platform for clinical application. The GUI has been recommended for use by various stake holders in CT operations.

scholarly journals Patient-Informed Organ Dose Estimation in Clinical CT: Implementation and Effective Dose Assessment in 1048 Clinical Patients

2021 ◽  
Vol 216 (3) ◽  
pp. 824-834
Author(s):  
Wanyi Fu ◽  
Francesco Ria ◽  
William Paul Segars ◽  
Kingshuk Roy Choudhury ◽  
Joshua M. Wilson ◽  
...  
Keyword(s):  
Effective Dose ◽  
Organ Dose ◽  
Dose Assessment ◽  
Dose Estimation

EFFECTIVE DOSE ESTIMATION FROM ORGAN DOSE MEASUREMENTS IN FAST-kV SWITCH DUAL ENERGY COMPUTED TOMOGRAPHY

2018 ◽  
Author(s):  
Justin Raudabaugh ◽  
Giao Nguyen ◽  
Carolyn Lowry ◽  
Natalie Januzis ◽  
James Colsher ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Effective Dose ◽  
Organ Dose ◽  
Dual Energy ◽  
Dose Estimation ◽  
Dual Energy Computed Tomography ◽  
Dose Measurements

Assessment of the Effective Dose in Neutron-Irradiated Workplaces Within an Anthropomorphic Phantom

2009 ◽  
Vol 168 (1) ◽  
pp. 149-153
Author(s):  
C. Villagrasa ◽  
J. Darréon ◽  
I. Clairand ◽  
F. Quéinnec
Keyword(s):  
Effective Dose ◽  
Anthropomorphic Phantom

scholarly journals Digital orthodontic radiographic set versus cone-beam computed tomography: an evaluation of the effective dose

2016 ◽  
Vol 21 (4) ◽  
pp. 66-72 ◽  
Author(s):  
Lillian Atsumi Simabuguro Chinem ◽  
Beatriz de Souza Vilella ◽  
Cláudia Lúcia de Pinho Maurício ◽  
Lucia Viviana Canevaro ◽  
Luiz Fernando Deluiz ◽  
...  
Keyword(s):  
Computed Tomography ◽  
New York ◽  
Effective Dose ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Radiological Protection ◽  
Anthropomorphic Phantom ◽  
Thermoluminescent Dosimeters ◽  
Optimization Principle ◽  
Effective Doses

ABSTRACT Objective: The aim of this study was to compare the equivalent and effective doses of different digital radiographic methods (panoramic, lateral cephalometric and periapical) with cone-beam computed tomography (CBCT). Methods: Precalibrated thermoluminescent dosimeters were placed at 24 locations in an anthropomorphic phantom (Alderson Rando Phantom, Alderson Research Laboratories, New York, NY, USA), representing a medium sized adult. The following devices were tested: Heliodent Plus (Sirona Dental Systems, Bernsheim, Germany), Orthophos XG 5 (Sirona Dental Systems, Bernsheim, Germany) and i-CAT (Imaging Sciences International, Hatfield, PA, USA). The equivalent doses and effective doses were calculated considering the recommendations of the International Commission of Radiological Protection (ICRP) issued in 1990 and 2007. Results: Although the effective dose of the radiographic set corresponded to 17.5% (ICRP 1990) and 47.2% (ICRP 2007) of the CBCT dose, the equivalent doses of skin, bone surface and muscle obtained by the radiographic set were higher when compared to CBCT. However, in some areas, the radiation produced by the orthodontic set was higher due to the complete periapical examination. Conclusion: Considering the optimization principle of radiation protection, i-CAT tomography should be used only in specific and justified circumstances. Additionally, following the ALARA principle, single periapical radiographies covering restricted areas are more suitable than the complete periapical examination.

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