Iterative Reconstruction Technique for Reducing Body Radiation Dose at CT: Feasibility Study

Hara, Amy K.; Paden, Robert G.; Silva, Alvin C.; Kujak, Jennifer L.; Lawder, Holly J.; Pavlicek, William

doi:10.2214/ajr.09.2397

Cited by 668 publications

(390 citation statements)

References 20 publications

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“…Other studies have reported oversmoothing and degraded high‐contrast resolution using low‐dose ASIR 2 , 10 . To our knowledge, the amount of loss/gain achieved using this approach has not yet been quantified.…”

Section: Introductionmentioning

confidence: 84%

“…Chest diagnosis using ASIR and ASIR‐high definition (ASIR‐HD) has shown acceptable image quality or improved confidence 7 , 8 , 9 . Hara et al (10) reported that using ASIR with a 50% lower radiation dose compared to the routine dose can still fulfill the American College of Radiology (ACR) criteria in terms of low and high contrast; (11) however, the high‐contrast resolution is better when using the standard dose.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A qualitative and quantitative analysis of radiation dose and image quality of computed tomography images using adaptive statistical iterative reconstruction

Hussain

Mail

Shamy

et al. 2016

J Applied Clin Med Phys

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Image quality is a key issue in radiology, particularly in a clinical setting where it is important to achieve accurate diagnoses while minimizing radiation dose. Some computed tomography (CT) manufacturers have introduced algorithms that claim significant dose reduction. In this study, we assessed CT image quality produced by two reconstruction algorithms provided with GE Healthcare's Discovery 690 Elite positron emission tomography (PET) CT scanner. Image quality was measured for images obtained at various doses with both conventional filtered back‐projection (FBP) and adaptive statistical iterative reconstruction (ASIR) algorithms. A standard CT dose index (CTDI) phantom and a pencil ionization chamber were used to measure the CT dose at 120 kVp and an exposure of 260 mAs. Image quality was assessed using two phantoms. CT images of both phantoms were acquired at tube voltage (kV) of 120 with exposures ranging from 25 mAs to 400 mAs. Images were reconstructed using FBP and ASIR ranging from 10% to 100%, then analyzed for noise, low‐contrast detectability, contrast‐to‐noise ratio (CNR), and modulation transfer function (MTF). Noise was 4.6 HU in water phantom images acquired at 260 mAs/FBP 120 kV and 130 mAs/50% ASIR 120 kV. The large objects (frequency<7 lp/cm) retained fairly acceptable image quality at 130 mAs/50% ASIR, compared to 260 mAs/FBP. The application of ASIR for small objects (frequency>7 lp/cm) showed poor visibility compared to FBP at 260 mAs and even worse for images acquired at less than 130 mAs. ASIR blending more than 50% at low dose tends to reduce contrast of small objects (frequency>7 lp/cm). We concluded that dose reduction and ASIR should be applied with close attention if the objects to be detected or diagnosed are small (frequency>7 lp/cm). Further investigations are required to correlate the small objects (frequency>7 lp/cm) to patient anatomy and clinical diagnosis.PACS number(s): 87.57.‐s, 87.57.C, 87.57.cf, 87.57.cj, 87.57.cm, 87.57.cp, 87.57.N, 87.57.nf, 87.57.np, 87.57.nt, 87.57.Q, 87.59.‐e, 87.59.B

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

A qualitative and quantitative analysis of radiation dose and image quality of computed tomography images using adaptive statistical iterative reconstruction

Hussain

Mail

Shamy

et al. 2016

J Applied Clin Med Phys

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“…Adaptive statistical iterative reconstruction (ASIR) is a noise-efficient reconstruction algorithm [33,34] which is computationally fast and is proven to result in images with good low-contrast detail, preserved image quality, and with typical radiation dose reductions of greater than 30% [35]. Pilot studies with ASIR found that radiation dose can successfully be reduced by 50% in CT colonography [36], 4 ISRN Gastroenterology 44% in coronary CT angiography [37], and approximately 50% in CT abdomen and pelvis [38] without significantly affecting image quality.…”

Section: Low-dose Ct Technologymentioning

confidence: 99%

Minimization of radiation exposure due to computed tomography in inflammatory bowel disease

O’Neill

O’Connor

McWilliams

et al. 2011

Clinics and Research in Hepatology and Gastroenterology

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“…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%

“…Although there are some reports regarding the image quality of IRs, in which the resolution properties were evaluated with high-contrast objects [6,7,9,12], the results represent resolution properties only for high-contrast parts of the human body (e.g., bones) and do not indicate the properties for low-or middle-contrast objects.…”

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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Iterative Reconstruction Technique for Reducing Body Radiation Dose at CT: Feasibility Study

Abstract: These preliminary results support body CT dose index reductions of 32-65% when adaptive statistical iterative reconstruction is used. Studies with larger statistical samples are needed to confirm these findings.

Cited by 668 publications

References 20 publications

A qualitative and quantitative analysis of radiation dose and image quality of computed tomography images using adaptive statistical iterative reconstruction

A qualitative and quantitative analysis of radiation dose and image quality of computed tomography images using adaptive statistical iterative reconstruction

Minimization of radiation exposure due to computed tomography in inflammatory bowel disease

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

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