CT image quality improvement using adaptive iterative dose reduction with wide-volume acquisition on 320-detector CT

Gervaise, A.; Osemont, B.; Lecocq, S.; Noël, Alain; Micard, Émilien; Felblinger, Jacques; Blum, Alain

doi:10.1007/s00330-011-2271-7

Cited by 237 publications

(132 citation statements)

References 27 publications

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“…17) However, IR algorithms introduced from some vendors 17) represent new techniques designed to reduce image noise and improve image quality using low doses of radiation. [8][9][10] An in vivo study by Kurata et al revealed that Agatston scores tend to decrease as sonogram affirmed iterative reconstruction (SAFIRE) levels increase. 18) Our observation that Agatston scores tend to decrease as IR levels increase further support these conclusions.…”

Section: Discussionmentioning

confidence: 99%

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The Impact of Iterative Reconstruction on Reducing the Radiation Dose for Coronary Calcium Scoring: An Investigation Using Pulsating Calcified Coronary Phantom

Kobayashi

Yukihisa

et al. 2016

J St. Marianna Univ

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Aim:The aim of the present study was to evaluate the effects of radiation dose reduction and iterative reconstruction protocols on coronary artery calcium (Agatston) scores using a pulsating cardiac phantom. Materials and Methods:We used a pulsating cardiac phantom containing three calcified cubes of different sizes (3-mm diameter: small, 4-mm diameter: medium, and 5-mm diameter: large) and four calcified hydroxyapatite cubes of varying density in order to model coronary artery calcification: 5% (44HU), 15% (233HU), 25% (586HU), and 35% (792HU). Images were acquired with a 320-slice MDCT (Aquilion ONE ViSION Edition, Toshiba, Nasu, Japan), using ECG gated volume scans with tube potential:120kV, 275 ms rotation time, 60, 70, 100, 150 and 240mA tube current. The Agatston scores at all dose variations in all five reconstruction methods (filtered back projection [FBP] and adaptive iterative dose reconstruction [AIDR3D]: Weak, Mild, Standard, and Strong) for all three phantom sizes were compared to the reference dose protocol reconstructed with FBP. Results: When the FBP and AIDR 3D: Weak protocol were used, Agatston scores significantly increased in all phantom sizes as doses of radiation decreased (p<0.001). When the AIDR3D: Mild, Standard, and Strong protocols were used, no significant differences in Agatston scores were observed for any phantom size among different radiation dose protocols. For all radiation dose protocols, Agatston scores significantly decreased as IR levels increased (p<0.003, respectively). When AIDR 3D: Mild was used, no significant differences in Agatston scores were observed between IR and FBP protocols for any phantom size. Conclusions: The AIDR3D: Mild protocol allowed for significant reductions in radiation dose relative to standard FBP protocols, without influencing Agatston scores. Therefore, evaluation of CAC score using a combination of low-dose radiation and IR may present a reliable alternative to conventional CAC scoring.

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Section: Discussionmentioning

confidence: 99%

“…[8][9][10] Furthermore, some ex vivo and in vitro studies have reported no significant differences in CAC score between standard-dose FBP and low-dose IR algorithms when the CAC score is relatively high (300-700). [11][12][13] However, the effects of dose reduction and IR on CAC score remain uncertain when the CAC score is low.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Iterative Reconstruction on Reducing the Radiation Dose for Coronary Calcium Scoring: An Investigation Using Pulsating Calcified Coronary Phantom

Kobayashi

Yukihisa

et al. 2016

J St. Marianna Univ

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“…CT scan conditions were 120-kV tube voltage, 450-mA tube current, 1.0 s per rotation, slice collimation of 280 3 0.5 mm and volumetric scan mode. Reconstruction conditions were a 1.0-mm slice thickness using the iterative reconstruction algorithm adaptive iterative dose reduction 3D (AIDR3D), [21][22][23] with or without SEMAR. The convolution kernel was the standard body (FC13).…”

Section: Phantom Study Data Acquisitionmentioning

confidence: 99%

Single-energy metal artefact reduction with CT for carbon-ion radiation therapy treatment planning

Miki¹,

Mori²,

Hasegawa³

et al. 2016

BJR

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Objective: One approach to improving image quality of CT is to use metal artefact reduction image processing, such as single-energy metal artefact reduction (SEMAR). To quantify the impact of image correction on the quality of carbon-ion dose distribution, treatment planning using SEMAR was evaluated. Methods: Using a head phantom into which metal screws could be inserted, we acquired standard planning CT images. We calculated dose distributions using phantom images with and without metal added, and with and without SEMAR. Hounsfield unit (HU) and dose distribution variation of these images with and without SEMAR were measured using metal-free image subtraction. We similarly analysed the image data sets of two patients with head and neck cancer who had dental implants. Results: HU difference between metal-containing images and metal-free images without and with SEMAR were 279.5 6 97.2 HU and 21.4 6 19.5 HU on severe artefact area, respectively. The range of dose distribution difference from the prescribed dose between uncorrected and SEMAR-corrected images varied from 219.5% to 23.4% within planning target volume (PTV). PTV-D 95 (%) for uncorrected and SEMAR-corrected image data were 82.4% and 95.4%, respectively. For data in patients with metal dental work, PTV-D 95 (%) for uncorrected and SEMAR-corrected data were 92.2% and 92.5% (Patient 1), and 90.9% and 95.7% (Patient 2), respectively. Conclusion: SEMAR algorithm shows promise in improving CT image quality and in ensuring an accurate representation of dose distribution.

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“…In this work, ASIR and iDose 4 provided almost the same MTF as that of FBP, and VEO indicated a higher MTF than that of FBP. Gervaise et al [8] demonstrated MTF results of the first generation of IR developed by Toshiba Medical Systems, AIDR, measured using a phantom including a 0.28-mm tungsten wire. In the study, there was no spatial resolution difference between FBP and AIDR.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, some reconstruction methods that make use of the iterative reconstruction (IR) technique have been developed by major CT manufacturers, and these methods have been applied to clinical CT examinations [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Spatial resolution measurement for iterative reconstruction by use of image-averaging techniques in computed tomography

Urikura

Ichikawa

Hara

et al. 2014

Radiol Phys Technol

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The purpose of our study was to investigate the validity of a spatial resolution measuring method that uses a combination of a bar-pattern phantom and an imageaveraging technique, and to evaluate the spatial resolution property of iterative reconstruction (IR) images with middle-contrast (50 HU) objects. We used computed tomography (CT) images of the bar-pattern phantom reconstructed by the IR technology Adaptive Iterative Dose Reduction 3D (AIDR 3D), which was installed in the multidetector CT system Aquilion ONE (Toshiba Medical Systems, Otawara, Japan). The contrast of the bar-pattern image was set to 50 HU, which is considered to be a middle contrast that requires higher spatial resolution clinically. We employed an image-averaging technique to eliminate the influence of image noise, and we obtained averaged images of the bar-pattern phantom with sufficiently low noise. Modulation transfer functions (MTFs) were measured from the images. The conventional wire method was also used for comparison; in this method, AIDR 3D showed MTF values equivalent to those of filtered back projection. For the middle-contrast condition, the results showed that the MTF of AIDR 3D decreased with the strength of IR processing. Further, the MTF of AIDR 3D decreased with dose reduction. The imageaveraging technique used was effective for correct evaluation of the spatial resolution for middle-contrast objects in IR images. The results obtained by our method clarified that the resolution preservation of AIDR 3D was not sufficient for middle-contrast objects.

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CT image quality improvement using adaptive iterative dose reduction with wide-volume acquisition on 320-detector CT

Abstract: This study showed that Adaptive Iterative Dose Reduction (AIDR) reduces image noise. In a phantom image noise was reduced without altering spatial resolution. In patients AIDR reduced… Show more

Cited by 237 publications

References 27 publications

The Impact of Iterative Reconstruction on Reducing the Radiation Dose for Coronary Calcium Scoring: An Investigation Using Pulsating Calcified Coronary Phantom

The Impact of Iterative Reconstruction on Reducing the Radiation Dose for Coronary Calcium Scoring: An Investigation Using Pulsating Calcified Coronary Phantom

Single-energy metal artefact reduction with CT for carbon-ion radiation therapy treatment planning

Spatial resolution measurement for iterative reconstruction by use of image-averaging techniques in computed tomography

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