scholarly journals Can Patient’s Body Weight Represent Body Diameter for Pediatric Size-Specific Dose Estimate in Thoracic and Abdominal Computed Tomography?

2019 ◽  
Vol 9 ◽  
pp. 24 ◽  
Author(s):  
Supika Kritsaneepaiboon ◽  
Suwadee Eng-chuan ◽  
Saowapark Yoykaew
Keyword(s):  
Computed Tomography ◽  
Body Weight ◽  
Statistical Significance ◽  
Correlation Coefficients ◽  
Effective Diameter ◽  
Dose Estimate ◽  
Ct Dose ◽  
Body Diameter ◽  
Ct Dose Index ◽  
Dose Index

Objective: The objective of the study was to determine whether body weight (BW) can be substituted for body diameters to calculate size-specific dose estimate (SSDE) in the children. Materials and Methods: A total of 196 torso computed tomography (CT) studies were retrospectively reviewed. Anteroposterior diameter (DAP) and lateral diameter (Dlat) were measured, and DAP+Dlat, effective diameter, SSDE diameter and SSDEBW were calculated. Correlation coefficients among body diameters, all SSDE types and percentage changes between CT dose index volumes and SSDEs were analyzed by BW and age subgroups. Results: Overall BW was more strongly correlated with body diameter (r = 0.919–0.960, P < 0.001) than was overall age (r = 0.852–0.898, P < 0.001). The relationship between CT dose index volume and each of the SSDE types (r = 0.934–0.953, P < 0.001), between SSDEBW and all SSDE diameters (r = 0.934–0.953, P < 0.001), and among SSDE diameters (r = 0.950–0.989, P < 0.001) overall had strong correlations with statistical significance. The lowest magnitude difference was SSDEBW−SSDEeff. Conclusion: BW can be used instead of body diameter to calculate all SSDE types, with our suggested best accuracy for SSDEeff and the least variation in age < four years and BW < 20 kg. Key Messages: Size-specific dose estimate (SSDE) is a new and accurate dose-estimating parameter for the individual patient which is based on the actual size or body diameter of the patient. BW can be an important alternative for all body diameters to estimate size-specific dose or calculate SSDE in children.

Organ doses can be estimated from the computed tomography (CT) dose index for cone-beam CT on radiotherapy equipment

2016 ◽  
Vol 36 (2) ◽  
pp. 215-229 ◽  
Author(s):  
Colin J Martin ◽  
Abdullah Abuhaimed ◽  
Marimuthu Sankaralingam ◽  
Mohamed Metwaly ◽  
David J Gentle
Keyword(s):  
Computed Tomography ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Organ Doses ◽  
Ct Dose ◽  
Ct Dose Index ◽  
Dose Index

Validity of the size-specific dose estimate in adults undergoing coronary CT angiography: comparison with the volume CT dose index

2015 ◽  
Vol 31 (S2) ◽  
pp. 205-211 ◽  
Author(s):  
Masafumi Kidoh ◽  
Daisuke Utsunomiya ◽  
Seitaro Oda ◽  
Yoshinori Funama ◽  
Hideaki Yuki ◽  
...  
Keyword(s):  
Ct Angiography ◽  
Coronary Ct Angiography ◽  
Dose Estimate ◽  
Ct Dose ◽  
Coronary Ct ◽  
Ct Dose Index ◽  
Volume Ct ◽  
Dose Index

Spatial Distribution of Dose in Computed Tomography with Special Reference to Thin-Slice Techniques

1987 ◽  
Vol 28 (6) ◽  
pp. 771-777 ◽  
Author(s):  
U. Moström ◽  
C. Ytterbergh
Keyword(s):  
Computed Tomography ◽  
Spatial Distribution ◽  
Dose Distribution ◽  
Absorbed Dose ◽  
Average Dose ◽  
Ct Dose ◽  
Multiple Scan ◽  
Ct Dose Index ◽  
The Difference ◽  
Dose Index

The spatial dose distribution in a cylindrical polystyrene phantom with a diameter of 200 mm was measured for seven computed tomography (CT) scanners. The measurements were performed in the head mode and mainly for narrow slices in the range 1.5 to 4 mm. Both radial and axial dose profiles were measured and the dose distribution for multiple-scan procedures was calculated. The ratio between the surface and centre doses for a single scan varied between the extremes of 1.8 and 4.3 and was generally higher for narrow than for wide slices. With multiple nominally contiguous scans the difference in absorbed dose between surface and centre locations in the object decreased, on account of scattered radiation. The CT dose index for centre locations varied considerably between the tested scanners, with a range from 5.6 to 27.2 mGy per nominal 100 mAs. For a simulated multiple-scan procedure, comparable to a CT examination of the orbits, the multiple-scan average dose varied between 4.3 and 16.4 mGy per nominal 100 mAs.

Reduced Kilovoltage in Computed Tomography–Guided Intervention in a Community Hospital: Effect on the Radiation Dose

2014 ◽  
Vol 65 (4) ◽  
pp. 345-351 ◽  
Author(s):  
Saman Rezazadeh ◽  
Steven J. Co ◽  
Simon Bicknell
Keyword(s):  
Low Dose ◽  
Effective Diameter ◽  
Tube Voltage ◽  
Dose Length Product ◽  
Ct Guided ◽  
Ct Dose ◽  
Patient Size ◽  
Ct Dose Index ◽  
Volume Ct ◽  
Dose Index

Purpose The purpose of this study was to determine whether low-kilovoltage (80 or 100 kV) computed tomography (CT)-guided interventions performed in a community-based hospital are feasible and to compare radiation exposure incurred with conventional 120 kV potential. Materials and Methods Effective doses (ED) received by patients who underwent CT-guided intervention were analysed before and after a low-dose kilovoltage protocol was instituted in our department. We performed CT-guided procedures of 93 consecutive patients by using conventional 120-kV tube voltage (50 patients) and a low voltage of 80 or 100 kV for the remainder of this cohort. Automatic tube current modulation was enabled to obtain the best image quality. Procedure details were prospectively recorded and included examination site and type, slice width, tube voltage and current, dose length product, volume CT dose index, and size-specific dose estimate. Dose length product was converted to ED to account for radiosensitivity of specific organs. Statistical comparisons with test differences in the ED, volume CT dose index, size-specific dose estimate, and effective diameter (patient size) were made by using the Student t test. Results All but 6 of the procedures performed at 80 kV were successful, for a success rate of 86%. At lower voltages, the ED was significantly ( P < .01) reduced, on average, by 57%, 73%, and 65% for the pelvic, chest, and abdomen procedures, respectively. Conclusion A low-dose radiation technique by using 80 or 100 kV results in a high technical success rate for pelvic, chest, and abdomen CT-guided interventional procedures, although dramatically decreasing radiation exposure. There was no significant difference in effective diameter (patient size) between the conventional and the low-dose groups, which would suggest that dose reduction was indeed a result of kVp change and not patient size.

VOLUME CT DOSE INDEX AND DOSE-LENGTH PRODUCT VALUES ACCORDING TO FACILITY SIZE IN JAPAN

2020 ◽  
Vol 188 (2) ◽  
pp. 261-269
Author(s):  
Yuta Matsunaga ◽  
Yuya Kondo ◽  
Kenichi Kobayashi ◽  
Masanao Kobayashi ◽  
Kazuyuki Minami ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contrast Agent ◽  
Ct Scanner ◽  
Dose Length Product ◽  
Ct Dose ◽  
Volume Computed Tomography ◽  
Ct Dose Index ◽  
Computed Tomography Dose Index ◽  
Facility Size ◽  
Dose Index

Abstract The aim of this study was to investigate differences in volume computed tomography dose index (CTDIvol) and dose-length product (DLP) values according to facility size in Japan. A questionnaire survey was sent to 3000 facilities throughout Japan. Data from each facility were collected including bed number, computed tomography (CT) scan parameters employed and the CTDIvol and/or DLP values displayed on the CT scanner during each examination. The CTDIvol and DLP for 11 adult and 6 paediatric CT examinations were surveyed. Comparison of CTDIvol and DLP values of each examination according to facility size revealed key differences in CT dose between small and large facilities. This study highlights the importance of lowering the dose of coronary artery examination with contrast agent in smaller facilities and of lowering the dose of adult and paediatric head CT without contrast agent in larger facilities. The results of this study are valid in Japan.

scholarly journals Association of Radiation Doses and Cancer Risks from CT Pulmonary Angiography Examinations in Relation to Body Diameter

Diagnostics ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 681
Author(s):  
Hanif Haspi Harun ◽  
Muhammad Khalis Abdul Karim ◽  
Zulkifly Abbas ◽  
Mohd Amir Abdul Rahman ◽  
Akmal Sabarudin ◽  
...  
Keyword(s):  
Pulmonary Angiography ◽  
Mean Value ◽  
The Body ◽  
Effective Diameter ◽  
Ct Pulmonary Angiography ◽  
Ct Dose ◽  
Body Diameter ◽  
Ct Dose Index ◽  
Probability Of Cancer ◽  
Risk Of Cancer

In this study, we aimed to estimate the probability of cancer risk induced by CT pulmonary angiography (CTPA) examinations concerning effective body diameter. One hundred patients who underwent CTPA examinations were recruited as subjects from a single institution in Kuala Lumpur. Subjects were categorized based on their effective diameter size, where 19–25, 25–28, and >28 cm categorized as Groups 1, 2, and 3, respectively. The mean value of the body diameter of the subjects was 26.82 ± 3.12 cm, with no significant differences found between male and female subjects. The risk of cancer in breast, lung, and liver organs was 0.009%, 0.007%, and 0.005% respectively. The volume-weighted CT dose index (CTDIvol) was underestimated, whereas the size-specific dose estimates (SSDEs) provided a more accurate description of the radiation dose and the risk of cancer. CTPA examinations are considered safe but it is essential to implement a protocol optimized following the As Low as Reasonably Achievable (ALARA) principle.

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