Dose reduction with iterative reconstruction: Optimization of CT protocols in clinical practice

Greffier, Joël; Macrì, Francesco; Larbi, Ahmed; Fernandez, Arnaud; Khasanova, Elina; Pereira, F.; Mekkaoui, Choukri; Beregi, Jean‐Paul

doi:10.1016/j.diii.2015.02.007

Cited by 80 publications

(33 citation statements)

References 27 publications

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“…Approaches like modulation of automatic tube current, increasing the pitch of helical scanning, reducing the tube voltage, reconstructive methods like iterative reconstruction were used. 26,27,28 In our study, we incorporated the use of AIDR reconstructions and automatic modulation of tube current to reduce the patient radiation dose. Thus to summarize, we came across very few studies describing about the association in between renal vascular variations and gender.…”

Section: Discussionmentioning

confidence: 99%

Prevalence of Renal Vascular Variations in Patients Subjected to Contrast CT Abdomen

Agarwal¹,

Aiyappan²,

Mathuram³

et al. 2019

IJCMSR

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To determine the prevalence of renal artery and renal vein variations in the patients subjected to contrast CT abdomen and to assess the gender specific variations in renal artery and renal vein. Material and methods: The study was conducted in the department of Radiodiagnosis, SRM Medical College, Kattankulathur from March 2017 to August 2018. A total of 223 patients who were subjected to MDCT contrast abdomen study for various complaints were evaluated for the renal vascular variations. The study was done in two phases arterial and venous with field of view from the dome of diaphragm to the iliac crest. The axial images obtained were post-processed by MPR, MIP and VR techniques. Results: Renal vascular variants are highly variable as observed in the previous studies. In our study, the most common renal artery variation was accessory renal artery and most common renal vein variation was multiple renal veins. No statistically significant association between gender and Renal artery, Renal vein or main renal artery lumen size was observed. Maximum renal arteries both on right and left side were seen arising at the level of L1. Conclusions: MDCT is ideal for imaging. RA and RV variations including the number and course. Accessory renal artery is the most frequently observed variation in renal arteries and multiple renal vein is the most common variation of right renal vein. Retroaortic left renal vein was the most common variation observed on left side. Between gender and RA or RV no statistically significant association was demonstrated.

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Section: Discussionmentioning

confidence: 99%

Prevalence of Renal Vascular Variations in Patients Subjected to Contrast CT Abdomen

Agarwal¹,

Aiyappan²,

Mathuram³

et al. 2019

IJCMSR

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“…The recent introduction of iterative reconstruction algorithms has significantly reduced image noise compared to standard FBP reconstructions [14][15][16][17][18][52][53][54][55][56]. So, when doses are lowered by mA and kV reductions, iterative reconstructions compensate for the decreased image quality.…”

Section: Iterative Reconstructionsmentioning

confidence: 96%

How to perform low-dose computed tomography for renal colic in clinical practice

Gervaise¹,

Gervaise-Henry²,

Pernin³

et al. 2016

Diagnostic and Interventional Imaging

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Computed tomography (CT) has become the reference technique in medical imaging for renal colic, to diagnose, plan treatment and explore differential diagnosis. Its main limitation is the radiation dose, especially as urinary stone disease tends to relapse and mainly affects young people. It is therefore essential to reduce the CT radiation dose when renal colic is suspected. The goal of this review was twofold. First, we wanted to show how to use low-dose CT in patients with suspected renal colic in current clinical practice. Second, we wished to discuss the different ways of reducing CT radiation dose by considering both behavioral and technological factors. Among the behavioral factors, limiting the scan coverage area is a straightforward and effective way to reduce the dose. Improvement of technological factors relies mainly on using automatic tube current modulation, lowering the tube voltage and current as well using iterative reconstruction.

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“…Traditional filtered back projection (FBP) methods yield noisy images, susceptible to artifacts dependent on the reconstruction filters and radiation doses applied [4], but theoretically iterative reconstruction (IR) allows optimization of dose and image quality [5] through noise and artifact minimization [6]. The most common hybrid IR algorithms perform an initial weighted FBP reconstruction prior to IR noise removal to maintain familiar image appearances [7].…”

Section: Introductionmentioning

confidence: 99%

The Acceptability of Iterative Reconstruction Algorithms in Head CT: An Assessment of Sinogram Affirmed Iterative Reconstruction (SAFIRE) vs. Filtered Back Projection (FBP) Using Phantoms

Harris

Huckle

Anthony

et al. 2017

Journal of Medical Imaging and Radiation Sciences

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Background: Computed tomography (CT) is the primary imaging investigation for many neurologic conditions with a proportion of patients incurring cumulative doses. Iterative reconstruction (IR) allows dose optimization, but head CT presents unique image quality complexities and may lead to strong reader preferences. Objectives: This study evaluates the relationships between image quality metrics, image texture, and applied radiation dose within the context of IR head CT protocol optimization in the simulated patient setting. A secondary objective was to determine the influence of optimized protocols on diagnostic confidence using a custom phantom. Methods and Setting: A three-phase phantom study was performed to characterize reconstruction methods at the local reference standard and a range of exposures. CT numbers and pixel noise were quantified supplemented by noise uniformity, noise power spectrum, contrast-to-noise ratio (CNR), high-and low-contrast resolution. Reviewers scored optimized protocol images based on established reporting criteria. Results: Increasing strengths of IR resulted in lower pixel noise, lower noise variance, and increased CNR. At the reference standard, the image noise was reduced by 1.5 standard deviation and CNR increased by 2.0. Image quality was maintained at 24% relative dose reduction. With the exception of image sharpness, there were no significant differences between grading for IR and filtered back projection reconstructions. Conclusions: IR has the potential to influence pixel noise, CNR, and noise variance (image texture); however, systematically optimized IR protocols can maintain the image quality of filtered back projection. This work has guided local application and acceptance of lower dose head CT protocols.

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Dose reduction with iterative reconstruction: Optimization of CT protocols in clinical practice

Abstract: The software developed in this study may help radiologists in selecting adequate combinations of parameters that allows to obtain an appropriate image with dose reduction.

Cited by 80 publications

References 27 publications

Prevalence of Renal Vascular Variations in Patients Subjected to Contrast CT Abdomen

Prevalence of Renal Vascular Variations in Patients Subjected to Contrast CT Abdomen

How to perform low-dose computed tomography for renal colic in clinical practice

The Acceptability of Iterative Reconstruction Algorithms in Head CT: An Assessment of Sinogram Affirmed Iterative Reconstruction (SAFIRE) vs. Filtered Back Projection (FBP) Using Phantoms

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