scholarly journals Reducing Radiation Dose in Emergency CT Scans While Maintaining Equal Image Quality: Just a Promise or Reality for Severely Injured Patients?

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Ulrich Grupp ◽  
Max-Ludwig Schäfer ◽  
Henning Meyer ◽  
Alexander Lembcke ◽  
Alexander Pöllinger ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Effective Dose ◽  
Dose Reduction ◽  
Iterative Reconstruction ◽  
Study Groups ◽  
Image Noise ◽  
Effective Radiation Dose ◽  
Total Body ◽  
Effective Radiation ◽  
The Impact

Objective. This study aims to assess the impact of adaptive statistical iterative reconstruction (ASIR) on CT imaging quality, diagnostic interpretability, and radiation dose reduction for a proven CT acquisition protocol for total body trauma.Methods. 18 patients with multiple trauma (ISS≥16) were examined either with a routine protocol (n=6), 30% (n=6), or 40% (n=6) of iterative reconstruction (IR) modification in the raw data domain of the routine protocol (140 kV, collimation: 40, noise index: 15). Study groups were matched by scan range and maximal abdominal diameter. Image noise was quantitatively measured. Image contrast, image noise, and overall interpretability were evaluated by two experienced and blinded readers. The amount of radiation dose reductions was evaluated.Results. No statistically significant differences between routine and IR protocols regarding image noise, contrast, and interpretability were present. Mean effective dose for the routine protocol was25.3±2.9 mSv,19.7±5.8 mSv for the IR 30, and17.5±4.2 mSv for the IR 40 protocol, that is, 22.1% effective dose reduction for IR 30 (P=0.093) and 30.8% effective dose reduction for IR 40 (P=0.0203).Conclusions. IR does not reduce study interpretability in total body trauma protocols while providing a significant reduction in effective radiation dose.

scholarly journals Simulated Radiation Dose Reduction in Whole-Body CT on a 3rd Generation Dual-Source Scanner: An Intraindividual Comparison

Diagnostics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 118
Author(s):  
Andreas S. Brendlin ◽  
Moritz T. Winkelmann ◽  
Phuong Linh Do ◽  
Vincent Schwarze ◽  
Felix Peisen ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Dose Reduction ◽  
Whole Body ◽  
Reference Standard ◽  
Diagnostic Confidence ◽  
Effective Radiation Dose ◽  
Intraindividual Comparison ◽  
Dual Source ◽  
Effective Radiation

To evaluate the effect of radiation dose reduction on image quality and diagnostic confidence in contrast-enhanced whole-body computed tomography (WBCT) staging. We randomly selected March 2016 for retrospective inclusion of 18 consecutive patients (14 female, 60 ± 15 years) with clinically indicated WBCT staging on the same 3rd generation dual-source CT. Using low-dose simulations, we created data sets with 100, 80, 60, 40, and 20% of the original radiation dose. Each set was reconstructed using filtered back projection (FBP) and Advanced Modeled Iterative Reconstruction (ADMIRE®, Siemens Healthineers, Forchheim, Germany) strength 1–5, resulting in 540 datasets total. ADMIRE 2 was the reference standard for intraindividual comparison. The effective radiation dose was calculated using commercially available software. For comparison of objective image quality, noise assessments of subcutaneous adipose tissue regions were performed automatically using the software. Three radiologists blinded to the study evaluated image quality and diagnostic confidence independently on an equidistant 5-point Likert scale (1 = poor to 5 = excellent). At 100%, the effective radiation dose in our population was 13.3 ± 9.1 mSv. At 20% radiation dose, it was possible to obtain comparably low noise levels when using ADMIRE 5 (p = 1.000, r = 0.29). We identified ADMIRE 3 at 40% radiation dose (5.3 ± 3.6 mSv) as the lowest achievable radiation dose with image quality and diagnostic confidence equal to our reference standard (p = 1.000, r > 0.4). The inter-rater agreement for this result was almost perfect (ICC ≥ 0.958, 95% CI 0.909–0.983). On a 3rd generation scanner, it is feasible to maintain good subjective image quality, diagnostic confidence, and image noise in single-energy WBCT staging at dose levels as low as 40% of the original dose (5.3 ± 3.6 mSv), when using ADMIRE 3.

scholarly journals Reducing cranial computed tomography effective radiation dose by 30% using adaptive iterative dose reduction

2016 ◽  
Vol 25 (4) ◽  
pp. 230-234
Author(s):  
Wai-Yung Yu ◽  
Thye Sin Ho ◽  
Henry Ko ◽  
Wai-Yee Chan ◽  
Serene Ong ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Radiation Dose ◽  
Dose Reduction ◽  
Diagnostic Image Quality ◽  
Radiation Doses ◽  
Effective Radiation Dose ◽  
Diagnostic Image ◽  
Ct Head ◽  
Effective Radiation

Introduction: The use of computed tomography (CT) imaging as a diagnostic modality is increasing rapidly and CT is the dominant contributor to diagnostic medical radiation exposure. The aim of this project was to reduce the effective radiation dose to patients undergoing cranial CT examination, while maintaining diagnostic image quality. Methods: Data from a total of 1003, 132 and 27 patients were examined for three protocols: CT head, CT angiography (CTA), and CT perfusion (CTP), respectively. Following installation of adaptive iterative dose reduction (AIDR) 3D software, tube current was lowered in consecutive cycles, in a stepwise manner and effective radiation doses measured at each step. Results: Baseline effective radiation doses for CT head, CTA and CTP were 1.80, 3.60 and 3.96 mSv, at currents of 300, 280 and 130–150 mA, respectively. Using AIDR 3D and final reduced currents of 160, 190 and 70–100 mA for CT head, CTA and CTP gave effective doses of 1.29, 3.18 and 2.76 mSv, respectively. Conclusion: We demonstrated that satisfactory reductions in the effective radiation dose for CT head (28.3%), CTA (11.6%) and CTP (30.1%) can be achieved without sacrificing diagnostic image quality. We have also shown that iterative reconstruction techniques such as AIDR 3D can be effectively used to help reduce effective radiation dose. The dose reductions were performed within a short period and can be easily achievable, even in busy departments.

scholarly journals Effective ?-radiation Dose on Chitosan for Preservation of Mangoes (Mangifera indica)

2013 ◽  
Vol 2 ◽  
pp. 35-40 ◽  
Author(s):  
Ashna Islam ◽  
Mahfuza Sharifa Sultana ◽  
Fahmida Parvin ◽  
Mubarak A Khan
Keyword(s):  
Weight Loss ◽  
Radiation Dose ◽  
Shelf Life ◽  
Effective Dose ◽  
Room Temperature ◽  
Color Change ◽  
Mangifera Indica ◽  
Chitosan Solution ◽  
Effective Radiation Dose ◽  
Effective Radiation

The effective dose of ? radiation on chitosan for mango preservation was studies in this work. The 2% chitosan solution was irradiated with at various total doses (50-200 kGy). The mature green mangoes were soaked in un-irradiated and irradiated chitosan solutions and then they were stored at normal room temperature. The percentage of weight loss, color change and percentage of spoilage were observed for 15 days in control, un-irradiated and irradiated chitosan coated mangoes. The overall results showed the superiority of 50 kGy and 100 kGy irradiated chitosan in extending shelf life of mango as comared to control, un-irradiated and 120 kGy to 200 kGy irradiated chitosan. Jahangirnagar University Environmental Bulletin, Vol.2, 35-40, 2013 DOI: http://dx.doi.org/10.3329/jueb.v2i0.16328

The impact of CT radiation dose reduction and iterative reconstruction algorithms from four different vendors on coronary calcium scoring

2014 ◽  
Vol 24 (9) ◽  
pp. 2201-2212 ◽  
Author(s):  
Martin J. Willemink ◽  
Richard A. P. Takx ◽  
Pim A. de Jong ◽  
Ricardo P. J. Budde ◽  
Ronald L. A. W. Bleys ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Dose Reduction ◽  
Iterative Reconstruction ◽  
Radiation Dose Reduction ◽  
Coronary Calcium ◽  
Calcium Scoring ◽  
Reconstruction Algorithms ◽  
Coronary Calcium Scoring ◽  
Ct Radiation ◽  
The Impact

scholarly journals Evaluating the impact of dose reduction software on Computed Tomography radiation dosimetry using radiology information systems meta data: An example of the use of novel linkable data.

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Rachael Moorin ◽  
Rene Forsyth ◽  
Richard Fox
Keyword(s):  
Clinical Practice ◽  
Radiation Dose ◽  
Dose Reduction ◽  
Iterative Reconstruction ◽  
Radiation Dosimetry ◽  
Experimental Studies ◽  
Ct Scanning ◽  
Meta Data ◽  
Reconstruction Software ◽  
The Impact

ABSTRACTObjectivesRecently concerns have been expressed regarding the cancer risk to patients undergoing CT scanning prompting the development of dose-reducing software. Experimental studies using phantoms, have shown the potential to significantly reduce radiation dose without compromising diagnostic accuracy. However since dose reduction requires acceptance of more noise in the image the findings from these studies may not be representative of the impact in routine clinical practice. The aim of this study was to evaluate the effect of introduction of iterative reconstruction software on radiation dosimetry in routine clinical practice over a range of CT examinationsApproachRandom samples of CT scans pertaining to 10 commonly performed CT examination types undertaken at two hospitals in Western Australia (WA), before and after the introduction of iterative reconstruction software were extracted from the WA centralised Picture Archiving Communication System. Technical information about the scanning parameters used and radiation dose metrics were extracted from the Digital Imaging and Communications in Medicine (DICOM) information contained in the meta-data for each examination. Changes in the mean dose length product and effective dose were evaluated along with estimations of associated changes to annual cancer incidence using established radiation dosimetry techniques.ResultsWe observed statistically significant reductions in the effective radiation dose for head CT (22-27%) consistent with those reported in the literature. In contrast the reductions observed for non-contrast chest (37-47%); chest pulmonary embolism study (28%), chest/abdominal/pelvic study (16%) and thoracic spine (39%) CT were lower than expected based on experimental studies. Statistically significant reductions in radiation dose were not identified in angiographic CT. Dose reductions translated to substantial lowering of the lifetime attributable risk, especially for younger females, and estimated numbers of incident cancers. ConclusionsOur study has demonstrated a reduction in radiation dose for some scanning protocols, but not to the extent experimental studies had previously shown or in all protocols expected, raising questions about the extent to which iterative reconstruction achieves dose reduction in real world clinical practice. In addition, our study showcases a practical application of the use of technical meta-data from CT scanning examinations to monitor radiation dose and evaluate the impact of dose reduction initiatives. These readily available data provide the ability to routinely monitor CT radiation dose (within and between providers) and, when linked to other administrative data, the opportunity to conduct large scale whole-of-population epidemiological studies evaluating the effect policies and practice on population radiation dose and cancer risk.

Radiation doses in diagnostic imaging for suspected physical abuse

2019 ◽  
Vol 104 (9) ◽  
pp. 863-868 ◽  
Author(s):  
Raylene Rao ◽  
Diana Browne ◽  
Brian Lunt ◽  
David Perry ◽  
Peter Reed ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Effective Dose ◽  
Physical Abuse ◽  
Background Radiation ◽  
Imaging Techniques ◽  
Bone Imaging ◽  
Effective Radiation Dose ◽  
Ct Head ◽  
Contrast Ct ◽  
Effective Radiation

ObjectiveTo measure the actual radiation dose delivered by imaging techniques commonly used in the radiography of suspected physical abuse and to make this information available to health professionals and families.MethodsData were collected retrospectively on children under 3 years referred for skeletal surveys for suspected physical abuse, non-contrast CT head scan or radionuclide imaging of the bones in Starship Children’s Hospital, Auckland, New Zealand from January to December 2015. Patient size-specific conversion coefficients were derived from International Commission on Radiologic Protection tissue weighting factors and used to calculate effective dose.ResultsSeventy-one patients underwent an initial skeletal survey, receiving a mean effective dose of 0.20 mSv (95% CI 0.18 to 0.22). Sixteen patients had a follow-up survey with a mean effective dose of 0.10 mSv (95% CI 0.08 to 0.11). Eighty patients underwent CT head which delivered a mean effective dose of 2.49 mSv (95% CI 2.37 to 2.60). Thirty-nine patients underwent radionuclide bone imaging which delivered a mean effective dose of 2.27 mSv (95% CI 2.11 to 2.43).ConclusionsIn a paediatric centre, skeletal surveys deliver a relatively low effective radiation dose, equivalent to approximately 1 month of background radiation. Non-contrast CT head scan and radionuclide bone imaging deliver similar doses, equivalent to approximately 1 year of background radiation. This information should be considered when gaining informed consent and incorporated in patient education handouts.

scholarly journals Biological effective dose, cumulative radiation dose, risk of malignancy and mortality rate estimation in adult patients who have a history of cancer and exposed to recurrent computed tomography

2019 ◽  
Vol 10 (2) ◽  
pp. 1405-1409 ◽  
Author(s):  
Amjaad Majeed Hameed ◽  
Dergham Majeed Hameed
Keyword(s):  
Computed Tomography ◽  
Mortality Rate ◽  
Radiation Dose ◽  
Effective Dose ◽  
Cumulative Dose ◽  
Primary Tumour ◽  
Effective Radiation Dose ◽  
Risk Of Malignancy ◽  
Cumulative Radiation Dose ◽  
Effective Radiation

Computed tomography is commonly used for the initial diagnosis of a tumour to provide information about the stage of cancer & to assess whether the disease is responding to treatment. Leukemia & solid tumour may have developed as a result of exposure to a low dose of diagnostic ionizing radiation so another primary tumour may develop as a result of radiation exposure. We used information in the patient sheet to measure patient effective radiation dose(E) in millisievert (mSv) & calculate cumulative dose by summation of dose over three years, estimated life attributed risk & mortality rate. The results of the current study revealed that from 50 patients 37 (74%) of them were female & 13 (26%) of them were male, age range 23- 80yr, breast cancer was the commonest cause of malignancy follow by lung cancer. Cumulative dose in mSv/yr rang 12-80 mSv, about 43(86%) of our patients exposed to more than 20mSv /yr & 7(14%) of them expose to 20 & less than 20 per year. Collective dose in three years’ range was 35-250 mSv mean 97 ± 37 Estimated radiological effective dose was more than 100 mSv in 22 (44%) per three years & 28(56%) of them had less than 100mSv. Life attributed risk for incidence of cancers was 1:285 -1:40 & mortality rate 0.21%-1.5%. A high percentage of patient 86% with cancer receive high radiation dose annually from CT scan more than considerable safe radiation dose for a worker in this field and 44% of our patient expose to cumulative dose more than 100 mSv per three which is also excess allowed dose for the radiological worker.

Sign in / Sign up

Export Citation Format

Share Document