Six iterative reconstruction algorithms in brain CT: a phantom study on image quality at different radiation dose levels

Löve, Áskell; Ml, Olsson; Siemund, Roger; Stålhammar, F; Björkman–Burtscher, Isabella M.; Söderberg, Marcus

doi:10.1259/bjr.20130388

Cited by 118 publications

(75 citation statements)

References 22 publications

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“…Larger differences have been reported between MBIR and FBP -19-20 HU for Delrin and 31-33 HU for Teflon -using the Catphan 600 and a bone-mimicking ring. (26) In our study, all three ASiR blends behaved similar to FBP, whereas MBIR reconstructed images had HU that were on average 10 HU lower than the FBP HU at 24 mGy. All these results indicate that MBIR affects HU, especially for materials above 200 HU (Teflon and Delrin).…”

Section: Discussionsupporting

confidence: 46%

Performance evaluation of iterative reconstruction algorithms for achieving CT radiation dose reduction — a phantom study

Dodge

Tamm

Cody

et al. 2016

J Applied Clin Med Phys

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The purpose of this study was to characterize image quality and dose performance with GE CT iterative reconstruction techniques, adaptive statistical iterative reconstruction (ASiR), and model-based iterative reconstruction (MBIR), over a range of typical to low-dose intervals using the Catphan 600 and the anthropomorphic Kyoto Kagaku abdomen phantoms. The scope of the project was to quantitatively describe the advantages and limitations of these approaches. The Catphan 600 phantom, supplemented with a fat-equivalent oval ring, was scanned using a GE Discovery HD750 scanner at 120 kVp, 0.8 s rotation time, and pitch factors of 0.516, 0.984, and 1.375. The mA was selected for each pitch factor to achieve CTDI vol values of 24, 18, 12, 6, 3, 2, and 1 mGy. Images were reconstructed at 2.5 mm thickness with filtered back-projection (FBP); 20%, 40%, and 70% ASiR; and MBIR. The potential for dose reduction and low-contrast detectability were evaluated from noise and contrast-to-noise ratio (CNR) measurements in the CTP 404 module of the Catphan. Hounsfield units (HUs) of several materials were evaluated from the cylinder inserts in the CTP 404 module, and the modulation transfer function (MTF) was calculated from the air insert. The results were confirmed in the anthropomorphic Kyoto Kagaku abdomen phantom at 6, 3, 2, and 1 mGy. MBIR reduced noise levels five-fold and increased CNR by a factor of five compared to FBP below 6 mGy CTDI vol , resulting in a substantial improvement in image quality. Compared to ASiR and FBP, HU in images reconstructed with MBIR were consistently lower, and this discrepancy was reversed by higher pitch factors in some materials. MBIR improved the conspicuity of the high-contrast spatial resolution bar pattern, and MTF quantification confirmed the superior spatial resolution performance of MBIR versus FBP and ASiR at higher dose levels. While ASiR and FBP were relatively insensitive to changes in dose and pitch, the spatial resolution for MBIR improved with increasing dose and pitch. Unlike FBP, MBIR and ASiR may have the potential for patient imaging at around 1 mGy CTDI vol . The improved low-contrast detectability observed with MBIR, especially at low-dose levels, indicate the potential for considerable dose reduction.

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Section: Discussionsupporting

confidence: 46%

Performance evaluation of iterative reconstruction algorithms for achieving CT radiation dose reduction — a phantom study

Dodge

Tamm

Cody

et al. 2016

J Applied Clin Med Phys

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“…The shape of the NPS curves is similar between FBP and iDose 4 , but considerably different for IMR (13) . Some radiologists claim that images reconstructed with iterative reconstruction methods have an unnatural appearance, and the different NPS curves may be the explanation for this.…”

Section: Discussionmentioning

confidence: 85%

Model-Based Iterative Reconstruction Enables the Evaluation of Thin-Slice Computed Tomography Images Without Degrading Image Quality or Increasing Radiation Dose

Aurumskjöld

Ydström

Tingberg

et al. 2015

Radiat Prot Dosimetry

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Computed tomography (CT) is one of the most important modalities in a radiological department. This technique produces images that enables radiological reports with high diagnostic confidence, but may provide an elevated radiation dose to the patient. The radiation dose can be reduced by using advanced image reconstruction algorithms. This study was performed on a Brilliance iCT, equipped with iDose 4 iterative reconstruction and an iterative model-based reconstruction (IMR) method. The purpose was to investigate the effect of reduced slice thickness combined with an IMR method on image quality compared with standard slice thickness with iDose 4 reconstruction. The results of objective and subjective image quality evaluations showed that a thinner slice combined with IMR can improve the image quality and reduce partial volume artefacts compared with the standard slice thickness with iDose 4 . In conclusion, IMR enables reduction of the slice thickness while maintaining or even improving image quality versus iDose 4 .

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“…28 This is a single vendor study, but similar results may be expected with other systems. 29 The results of this study are encouraging and warrant further research with a larger patient group and tandem OC to assess the specificity and sensitivity of the ultralow-dose CTC.…”

Section: Discussionmentioning

confidence: 68%

Model-basedvshybrid iterative reconstruction technique in ultralow-dose submillisievert CT colonography

Lambert

Ouředníček²,

Jahoda³

et al. 2015

BJR

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Results: The estimated radiation dose was 0.41 6 0.05 mSv for the supine and 0.42 6 0.04 mSv for the prone acquisitions. In the endoluminal view, the image quality was rated better in HIR, whereas better scores were obtained in MBIR in the cross-sectional view, where the endoluminal noise was the lowest (p , 0.0001). Five (26%) polyps were not identified using both computeraided detection and endoluminal inspection in FBP images vs only one (5%) in MBIR and none in HIR images.Conclusion: This study showed that in submillisievert ultralow-dose CTC, the image quality for the endoluminal view is better when HIR is used, whereas MBIR yields superior images for the cross-sectional view. The inferior quality of images reconstructed with FBP may result in decreased detection of colonic lesions. Advances in knowledge: Radiation dose from CTC can be safely reduced ,1 mSv for both positions when iterative reconstruction is used. MBIR provides better image quality in the cross-sectional view and HIR in the endoluminal view.

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Six iterative reconstruction algorithms in brain CT: a phantom study on image quality at different radiation dose levels

Abstract: The six evaluated IR algorithms all improve the image quality in brain CT but show different strengths and weaknesses.

Cited by 118 publications

References 22 publications

Performance evaluation of iterative reconstruction algorithms for achieving CT radiation dose reduction — a phantom study

Performance evaluation of iterative reconstruction algorithms for achieving CT radiation dose reduction — a phantom study

Model-Based Iterative Reconstruction Enables the Evaluation of Thin-Slice Computed Tomography Images Without Degrading Image Quality or Increasing Radiation Dose

Model-basedvshybrid iterative reconstruction technique in ultralow-dose submillisievert CT colonography

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