Patient dose reduction in CT

Lewis, Maria; Edyvean, Sue

doi:10.1259/bjr/75960844

Cited by 39 publications

(39 citation statements)

References 15 publications

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“…Concerns about population dose were fully justified since new diagnostic and interventional procedures were introduced into routine clinical practice and consequently the CT examination frequency was increased. Concerning individual patients, initial surveys did exhibit an increase in patient dose by about 34% [10,12,22,23] . This increase was rather expected considering design differences and the fact that, with MSCT, the scanning of a large volume of the body can be easily carried out using a smaller slice width than used with SSCT [10,12] .…”

Section: Msct Vs Ssct: Does Msct Increase Patient Dose?mentioning

confidence: 97%

“…With the improvement of computer and CT scanner technology, the commercial axial scanners could perform a chest-abdomen-pelvis examination in less than 30 min while, with the advent of helical scanners, this time was reduced to half. Then, around the end of the millennium, the multislice (or otherwise called multidetector) CT scanners came into use [10][11][12] . With the latest multislice CT (MSCT) scanners, a whole body examination can be performed in less than 5 min, with most of the time spent in patient positioning rather than the actual scanning procedure, which lasts less than 1 min.…”

Section: The Evolution Of Ct Technology and The Introduction Of New Cmentioning

confidence: 99%

“…Apart from the time gained, helical CT opened up a new world of applications ranging from the simple multiplanar reconstruction (MPR) images to CT angiography and CT endoscopy applications [10] , as well as the CT fluoroscopy that was used for real time imaging of patient anatomy during interventional procedures [13,14] . These new applications, however, were highly demanding and CT technology was forced to go one step beyond.…”

Section: The Evolution Of Ct Technology and The Introduction Of New Cmentioning

confidence: 99%

“…The basic differences of MSCT scanners from their predecessors, is that the MSCT scanners employ a matrix of detector elements (this is why they are alternatively called multidetector CT scanners or MDCT, in short) and a wider X-ray beam to accommodate the detector array' s larger width [10][11][12] . These features allow the acquisition of multiple helixes of data during a single rotation; that is, multiple images in a single rotation, and consequently fast volume scanning of large regions of human anatomy in a matter of just a few seconds.…”

Section: The Evolution Of Ct Technology and The Introduction Of New Cmentioning

confidence: 99%

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Patient dose considerations in computed tomography examinations

Tsalafoutas

Koukourakis²

2010

WJR

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Ionizing radiation is extensively used in medicine and its contribution to both diagnosis and therapy is undisputable. However, the use of ionizing radiation also involves a certain risk since it may cause damage to tissues and organs and trigger carcinogenesis. Computed tomography (CT) is currently one of the major contributors to the collective population radiation dose both because it is a relatively high dose examination and an increasing number of people are subjected to CT examinations many times during their lifetime. The evolution of CT scanner technology has greatly increased the clinical applications of CT and its availability throughout the world and made it a routine rather than a specialized examination. With the modern multislice CT scanners, fast volume scanning of the whole human body within less than 1 min is now feasible. Two dimensional images of superb quality can be reconstructed in every possible plane with respect to the patient axis (e.g. axial, sagital and coronal). Furthermore, three-dimensional images of all anatomic structures and organs can be produced with only minimal additional effort (e.g. skeleton, tracheobronchial tree, gastrointestinal system and cardiovascular system). All these applications, which are diagnostically valuable, also involve a significant radiation risk. Therefore, all medical professionals involved with CT, either as referring or examining medical doctors must be aware of the risks involved before they decide to prescribe or perform CT examinations. Ultimately, the final decision concerning justification for a prescribed CT examination lies upon the radiologist. In this paper, we summarize the basic information concerning the detrimental effects of ionizing radiation, as well as the CT dosimetry background. Furthermore, after a brief summary of the evolution of CT scanning, the current CT scanner technology and its special features with respect to patient doses are given in detail. Some numerical data is also given in order to comprehend the magnitude of the potential radiation risk involved in comparison with risk from exposure to natural background radiation levels.

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Section: Msct Vs Ssct: Does Msct Increase Patient Dose?mentioning

confidence: 97%

Section: The Evolution Of Ct Technology and The Introduction Of New Cmentioning

confidence: 99%

Section: The Evolution Of Ct Technology and The Introduction Of New Cmentioning

confidence: 99%

Section: The Evolution Of Ct Technology and The Introduction Of New Cmentioning

confidence: 99%

See 2 more Smart Citations

Patient dose considerations in computed tomography examinations

Tsalafoutas

Koukourakis²

2010

WJR

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“…Among the proposed dose reduction methods, the automatic exposure control (AEC) technique can be used to perform CT studies without distortions, such as substantial increases in image noise and artifacts (3)(4)(5)(6). Using chest CT, causing the lateral reduction to be more significant than the anteroposterior (AP) reduction (11).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Radiation Dose and Image Quality with Various Computed-Tomography Scout Views: The Angular Modulation Technique Based on Information Calculated from Scout Views

et al. 2016

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Background: While using the automatic exposure control technique in computed tomography (CT), the scout view determines the radiation dose for the CT scan by taking anatomical morphology into consideration. Objectives: The goal of this study was to estimate radiation doses during scout scanning and to evaluate the hypothesis that the radiation dose during CT depends on the location and order of the X-ray tubes. Materials and Methods: A CT scanner (GE VCT 64-channel) with the X-ray tubes placed in the anteroposterior (AP), lateral, and posteroanterior (PA) positions was used to acquire the scout views. The effective doses were assessed using an anthropomorphic chest phantom (RSD Inc., Long Beach, CA), an AAPM CT performance phantom (CIRS model 610), and CT dose indices (CTDI) head phantom. Both single and two scout views were tested with the three views combined according to the order of scanning. The CTDIs obtained from the CT unit dose report were used to compare the chest CT radiation doses, while the image quality was evaluated based on the root-mean-square error values calculated using the Image program. Results:The results of this study indicate that single AP (0°) scout views obtained with the z-axis modulation technique (AutomA) during chest CT scanning resulted in CTDIs that were lower than those generated by using lateral (90°) or PA (180°) scout views. The analysis of two-scout views using AutomA alone revealed the lowest CTDI in the 90°-0°scout views. However, based on the CT image noise analysis, a scout angle order of 0°-90°resulted in the optimal scout view combination with the minimal dose. Conclusion: Scout views may be useful in determining dose and image quality in CT scanning; however, it is necessary to first determine the most appropriate scout view for CT scans.

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CT dose reduction is achievable: one site's experience with a dose optimisation process

Smith

Mandarano

2010

Radiographer

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An Emotion 6 Siemens Multi‐Detector CT scanner (Erlangen, Germany) was installed at the review site in December 2005. Improving upon the manufacturer's default exposure settings, the authors sought to perform a quality review to reduce ionising radiation dose delivered to patients. Dose associated with CT examinations across the major body regions was assessed. Dose savings ranged from 11% to 70% when compared to the manufacturer's default settings. Dose comparisons are also made with the European Standards and the United Kingdom Field Survey.

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Patient dose reduction in CT

Cited by 39 publications

References 15 publications

Patient dose considerations in computed tomography examinations

Patient dose considerations in computed tomography examinations

Comparison of Radiation Dose and Image Quality with Various Computed-Tomography Scout Views: The Angular Modulation Technique Based on Information Calculated from Scout Views

CT dose reduction is achievable: one site's experience with a dose optimisation process

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