Phantom studies for possible dose reduction in CT head procedures

Staniszewska, Maria Anna; Obrzut, Marzanna

doi:10.1093/rpd/nch571

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…(B) The minimum recognizable diameter at three X-ray tube voltages. (C) The minimum recognizable diameter at three X-ray tube rotation times doses ''as low as reasonably achievable'' requires the specification of the image quality, such as the contrast resolution that is necessary for the purpose of the CT examination [14][15][16].…”

Section: Discussionmentioning

confidence: 99%

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Contrast resolution in multidetector-row CT with 16 detector rows: phantom study

Matsubara

Koshida

Suzuki

et al. 2007

Radiol Phys Technol

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This study was performed for evaluation of high- and low-contrast resolution in multidetector-row CT (MDCT) with 16 detector rows. For evaluating high-contrast resolution, a phantom was scanned ten times at 100 mA s with 24 patterns of scan parameters under several X-ray beam widths, X-ray tube voltages, X-ray tube rotation times, and helical pitches. Three radiological technologists observed the images visually. For evaluating low-contrast resolution, a phantom was scanned ten times at 100 mA s with the 24 patterns of scan parameters, which were the same as for high-contrast resolution. The images were examined based on receiver operating characteristic (ROC) curves. The high-contrast resolution deteriorated in the off-center locations when helical pitches of 1.375:1 or 1.75:1 were used. High helical pitch (>0.9375:1) and low tube voltage had significant effects on the low-contrast resolution. However, a wide X-ray beam width and short X-ray tube rotation time had no definite influence. Therefore, a helical pitch of 0.5625:1 should be used when the contrast resolutions are really important, and a wide X-ray beam width and short X-ray tube rotation time can improve the temporal resolution without deterioration of contrast resolution.

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Section: Discussionmentioning

confidence: 99%

“…Till date, contrast resolution, which is one of the most important factors in the physical characteristics of CT, has been evaluated in studies regarding scanner performance or image quality [11][12][13][14], and it is necessary for performing CT examinations that these are well understood.…”

Section: Introductionmentioning

confidence: 99%

Contrast resolution in multidetector-row CT with 16 detector rows: phantom study

Matsubara

Koshida

Suzuki

et al. 2007

Radiol Phys Technol

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“…As for Protocol One, the two observers rated image sets similarly imaging for many areas of the body but not for nonangiographic cerebral imaging [5][6][7], mainly because image blurring in the Z-direction obtained with the firstgeneration spiral CT systems led to the axiomatic concept of degraded image quality of helical acquisitions for brain CT when compared with incremental ones. Many radiologists throughout the world therefore still advocate the use of the incremental technique for routine brain CT, and most recent investigational works on brain CT deal only with the incremental technique [8][9][10]. Jones et al recently demonstrated the advantage of multirow detector setting over single-row for incremental brain CT by reducing the linear streak "beam-hardening" artifacts in the infratentorial space [15].…”

Section: Discussionmentioning

confidence: 99%

“…An a priori postulate inherited from the initial two decades of incremental brain CT experience and from the observation of blurring artifacts with first-generation helical CT systems still attributes a better image quality (IQ) for brain parenchymal analysis to the incremental acquisition modality when compared with the helical one. Most recent investigational studies on cerebral CT IQ and on helical CT dose reduction did not consider the use of the helical modality for routine brain imaging [8][9][10]. We attempted a two-step validation of the multislice helical technique for routine, unenhanced, brain CT examination.…”

Section: Introductionmentioning

confidence: 99%

Suitability of helical multislice acquisition technique for routine unenhanced brain CT: an image quality study using a 16-row detector configuration

et al. 2006

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Subjective and objective image quality (IQ) criteria, radiation doses, and acquisition times were compared using incremental monoslice, incremental multislice, and helical multislice acquisition techniques for routine unenhanced brain computed tomography (CT). Twenty-four patients were examined by two techniques in the same imaging session using a 16-row CT system equipped with 0.75-width detectors. Contiguous "native" 3-mm-thick slices were reconstructed for all acquisitions from four detectors for each slice (4x0.75 mm), with one channel available per detector. Two protocols were tailored to compare: (1) one-slice vs four-slice incremental images; (2) incremental vs helical four-slice images. Two trained observers independently scored 12 subjective items of IQ. Preference for the technique was assessed by one-tailed t test and the interobserver variation by two-tailed t test. The two observers gave very close IQ scores for the three techniques without significant interobserver variations. Measured IQ parameters failed to reveal any difference between techniques, and an approximate half radiation dose reduction was obtained by using the full 16-row configuration. Acquisition times were cumulatively shortened by using the multislice and the helical modality.

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“…Both phantom and clinical studies showed a lower tube voltage (with other settings such as tube current unchanged) could reduce radiation dose and improve image contrast for small-sized patients [27][28][29][30]. For example, a tube voltage as low as 60 kV could be used in pediatric CT examinations for structures with high subject contrast such as chest and bone [31].…”

Section: Tube Voltagementioning

confidence: 99%

Pediatric Computed Tomography Dose Optimization Strategies: A Literature Review

Mahrooqi

Sun

2015

Journal of Medical Imaging and Radiation Sciences

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Introduction: Computed tomography (CT) dose optimization is an important issue in radiography because CT is the largest contributor to medical radiation dose and its use is increasing. However, CT dose optimization for pediatric patients could be more challenging than their adult counterparts. The purpose of this literature review was to identify and discuss the current pediatric CT dose saving techniques. Optimized pediatric protocols were also proposed.Methods: A comprehensive literature search was conducted using the Medline, ProQuest Health and Medical Complete, PubMed, ScienceDirect, Scopus, Springer Link, and Web of Science databases and the keywords CT, pediatric, optimization, protocol, and radiation dose to identify articles focusing on pediatric CT dose optimization strategies published between 2004 and 2014.Results and Summary: Seventy-seven articles were identified in the literature search. Strategies for optimizing a range of scan parameters and technical considerations including tube voltage and current, iterative reconstruction, diagnostic reference levels, bowtie filters, scout view, pitch, scan collimation and time, overscanning, and overbeaming for pediatric patients with different ages and body sizes and compositions were discussed. An example of optimized pediatric protocols specific to age and body size for the 64-slice CT scanners was devised. It is expected that this example could provide medical radiation technologists, radiologists, and medical physicists with ideas to optimize their pediatric protocols.

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Phantom studies for possible dose reduction in CT head procedures

Cited by 8 publications

References 3 publications

Contrast resolution in multidetector-row CT with 16 detector rows: phantom study

Contrast resolution in multidetector-row CT with 16 detector rows: phantom study

Suitability of helical multislice acquisition technique for routine unenhanced brain CT: an image quality study using a 16-row detector configuration

Pediatric Computed Tomography Dose Optimization Strategies: A Literature Review

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