How inaccurate is weight as a metric for patient size? Comparing patient weight to effective diameter for size-specific dose estimation

2013 ◽  
Author(s):  
Tessa S. Cook ◽  
Seetharam C. Chadalavada ◽  
William W. Boonn
Keyword(s):  
Effective Diameter ◽  
Dose Estimation ◽  
Patient Size ◽  
Patient Weight

MO-D-134-05: Size Specific Dose Estimation in Abdominal CT: Impact of Longitudinal Variations in Patient Size

2013 ◽  
Vol 40 (6Part24) ◽  
pp. 402-403 ◽  
Author(s):  
S Leng ◽  
M Shiung ◽  
X Duan ◽  
L Yu ◽  
Y Zhang ◽  
...  
Keyword(s):  
Dose Estimation ◽  
Abdominal Ct ◽  
Longitudinal Variations ◽  
Patient Size

SU-E-I-28: Introduction and Investigation of Effective Diameter Ratios as a New Patient Size Metric for Use in CT

2015 ◽  
Vol 42 (6Part6) ◽  
pp. 3247-3248 ◽  
Author(s):  
R Lamoureux ◽  
L Sinclair ◽  
A Mench ◽  
I Lipnharski ◽  
C Carranza ◽  
...  
Keyword(s):  
Effective Diameter ◽  
Patient Size

Attenuation-based estimation of patient size for the purpose of size specific dose estimation in CT. Part I. Development and validation of methods using the CT image

2012 ◽  
Vol 39 (11) ◽  
pp. 6764-6771 ◽  
Author(s):  
Jia Wang ◽  
Xinhui Duan ◽  
Jodie A. Christner ◽  
Shuai Leng ◽  
Lifeng Yu ◽  
...  
Keyword(s):  
Ct Image ◽  
Dose Estimation ◽  
Validation Of Methods ◽  
Patient Size ◽  
Development And Validation

scholarly journals A simple manual method to estimate water-equivalent diameter for calculating size-specific dose estimate in chest computed tomography

2021 ◽  
Vol 94 (1117) ◽  
pp. 20200473
Author(s):  
Dimitris Mihailidis ◽  
Virginia Tsapaki ◽  
Pelagia Tomara
Keyword(s):  
Radiation Dose ◽  
Computer Programming ◽  
Chest Ct ◽  
Patient Dose ◽  
Equivalent Diameter ◽  
Effective Diameter ◽  
Manual Method ◽  
Dose Estimate ◽  
Patient Size ◽  
Patient Radiation Dose

Objectives: The American Association of Physicists in Medicine (AAPM) Task Groups (TG) 204 and 220 introduced a method to estimate patient dose by introducing the Size-Specific Dose Estimate (SSDE). They provided patient size-specific conversion factors that could be applied to volumetric CT Dose Index CTDIvol to estimate patient dose in terms of SSDE based on either effective diameter (Deff) or water equivalent diameter (Dw). Our study presented an alternative method to manually estimate SSDE for the everyday clinical routine chest CT that can be readily used and does not require sophisticated computer programming. Methods: For 16 adult patients undergoing chest CT, the method employed an average relative electron density (ρelung = 0.3) for the lung tissue and a ρetissue of 1.0 for the other tissues to scale the lateral thickness and compute the effective lateral thickness on the patient’s axial image. The proposed method estimated a “corrected” Deff (Deffcorr) to replace Dw and compared results with TG220 and a second method proposed by Huda et al, for the same set of CT studies. Results: The results showed comparable behavior for all methods. There is overall agreement especially between this study and TG220. Largest differences were +13.3% and+15.9% from TG220 and Huda values, respectively. Patient size correlation showed strong correlation with the TG220 and Huda et al methods. Conclusions: A simple, quick manual method to estimate CT patient radiation dose in terms of SSDE was proposed as an alternative where sophisticated computer programming is not available. It can be readily used during any clinical chest CT scanning. Advances in knowledge: The paper is novel as it presents simple, quick manual method to estimate CT patient radiation dose in chest imaging. The process can be used as alternative in cases no sophisticated computer programming is available.

8. Patient Size-Specific Dose Estimation

2012 ◽  
Vol 12 (1) ◽  
pp. 89-98
Author(s):  
J. M. Boone ◽  
J. A. Brink ◽  
S. Edyvean ◽  
W. Huda ◽  
W. Leitz ◽  
...  
Keyword(s):  
Dose Estimation ◽  
Patient Size

Patient-size specific effective dose estimation using SSDE in abdomen and chest CT exams

2016 ◽  
Vol 32 ◽  
pp. 94
Author(s):  
L. Trombetta ◽  
M. Maddalo ◽  
F. Locatelli ◽  
A. Pierelli ◽  
P. Salmoiraghi
Keyword(s):  
Effective Dose ◽  
Chest Ct ◽  
Dose Estimation ◽  
Patient Size

scholarly journals Using a Somatosensory Controller to Assess Body Size for Size-Specific Dose Estimates in Computed Tomography

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Jay Wu ◽  
Ruo-Ping Han ◽  
Yan-Lin Liu
Keyword(s):  
Computed Tomography ◽  
Body Size ◽  
Low Cost ◽  
Microsoft Kinect ◽  
Depth Image ◽  
Effective Diameter ◽  
Dose Estimation ◽  
Ct Scanner ◽  
The Mean ◽  
Anterior Posterior

Computed tomography (CT) has been widely used in the healthcare environment. Presently, the radiation dose in CT is determined using the size-specific dose estimate (SSDE). Accurate assessment of individual’s body size is essential for dose estimation. In this study, we integrated a somatosensory controller with a CT scanner to measure patient’s anterior-posterior diameter (APD) and lateral diameter (LATD) and calculate the corresponding effective diameter (ED). A total of 108 individuals with an average age of 38.6 years were enrolled in this study. Microsoft Kinect was used to acquire the depth image of subjects. A grayscale-to-surface height conversion curve was created using acrylic sheets for APD estimation. The APD, LATD, and ED were measured and compared with the results obtained using F ruler and CT images. The mean absolute differences for APD, LATD, and ED between Kinect and F ruler measurements were 5.2%, 1.3%, and 2.5%, respectively, while those between Kinect and CT measurements were 8.8%, 2.6%, and 5.0%, respectively. Kinect can replace CT or F ruler for real-time body size measurements. The use of the somatosensory controller has the advantages of simple, low cost, no radiation, and automatic calculation. It can accurately estimate patient’s APD, LATD, and ED for SSDE.

scholarly journals The effective and water-equivalent diameters as geometrical size functions for estimating CT dose in the thoracic, abdominal, and pelvic regions

2021 ◽  
Vol 27 (3) ◽  
pp. 213-222
Author(s):  
Winda Kusuma Dewi ◽  
Choirul Anam ◽  
Eko Hidayanto ◽  
Arrum Nitasari ◽  
Geoff Dougherty
Keyword(s):  
Computed Tomography ◽  
Equivalent Diameter ◽  
Effective Diameter ◽  
Strong Correlations ◽  
Thoracic Region ◽  
Specific Patient ◽  
Geometrical Size ◽  
Ct Dose ◽  
Patient Size ◽  
Anterior Posterior

Abstract Purpose: The aim of this work was to establish the relationships of patient size in terms of effective diameter (Deff) and water-equivalent diameter (Dw) with lateral (LAT) and anterior-posterior (AP) dimensions in order to predict the specific patient dose for thoracic, abdominal, and pelvic computed tomography (CT) examinations. Methods: A total of 47 thoracic images, 79 abdominal images, and 50 pelvic images were analyzed in this study. The patient’s images were retrospectively collected from Dr. Kariadi and Kensaras Hospitals, Semarang, Indonesia. The slices measured were taken from the middle of the scan range. The calculations of patient sizes (LAT, AP, Deff, and Dw) were automatically performed by IndoseCT 20b software. Deff and Dw were plotted as functions of LAT, AP, and AP+LAT. In addition, Dw was plotted as a function of Deff. Results: Strong correlations of Deff and Dw with LAT, AP, and AP+LAT were found. Stronger correlations were found in the Deff curves (R2 > 0.9) than in the Dw curves (R2 > 0.8). It was found that the average Deff was higher than the average Dw in the thoracic region, the average values were similar in the abdominal and pelvic regions. Conclusion: The current study extended the study of the relationships between Deff and Dw and the basic geometric diameter LAT, AP, and AP+LAT beyond those previously reported by AAPM. We evaluated the relationships for three regions, i.e. thoracic, abdominal, and pelvic regions. Based on our findings, it was possible to estimate Deff and Dw from only the LAT or AP dimension.

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