Ultralow-dose computed tomography imaging for surgery of midfacial and orbital fractures using ASIR and MBIR

Widmann, Gerlig; Torre, Daniel Dalla; Hörmann, Romed; Schullian, Peter; Gassner, Eva; Bale, Reto; Puelacher, Wolfgang

doi:10.1016/j.ijom.2015.01.011

Cited by 30 publications

(41 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Compared with a reference protocol at a CTDI vol of 35.3 mGy, the use of protocols with a CTDI vol of 1.0 and 2.6 mGy may be sufficient for the diagnosis of dislocated and non-dislocated craniofacial fractures, respectively. 7 Compared In the present study, a low-dose sinusitis protocol at CTDI vol of 18.28 mGy and several ultralow dose protocols at CTDI vol 4.14, 2.63, 0.99 and 0.53 mGy were evaluated in terms of HU stability and CNR. Compared with the reference protocol at CTDI vol of 36.58 mGy, the low-dose sinusitis protocol had a radiation exposure of only 50%, and the subsequent ultralow dose protocols I-IV have exposures of 11%, 7%, 3% and 1.5%, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…[4][5][6] It is not commonly known that recent CT technology allows high-resolution protocols at dose exposition equal or lower than CBCT (5 ultralow dose CT). 7,8 To reduce the increase of noise in ultralow dose imaging, iterative reconstruction technologies (IRTs) such as adaptive statistical iterative reconstruction (ASIR) and model-based iterative reconstruction (MBIR) have been implemented with promising potential. 8,9 To the best of the authors' knowledge, this is the first study that aimed to evaluate whether application of ultralow dose protocols and IRT influence HU and contrast-to-noise ratio (CNR), with a specific focus on dentomaxillofacial CT imaging.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultralow dose dentomaxillofacial CT imaging and iterative reconstruction techniques: variability of Hounsfield units and contrast-to-noise ratio

Widmann

Bischel

Stratis

et al. 2016

BJR

View full text Add to dashboard Cite

Objective: The aim of this study was to evaluate whether application of ultralow dose protocols and iterative reconstruction technology (IRT) influence quantitative Hounsfield units (HUs) and contrast-to-noise ratio (CNR) in dentomaxillofacial CT imaging. Methods: A phantom with inserts of five types of materials was scanned using protocols for (a) a clinical reference for navigated surgery (CT dose index volume 36.58 mGy), (b) low-dose sinus imaging (18.28 mGy) and (c) four ultralow dose imaging (4.14, 2.63, 0.99 and 0.53 mGy). All images were reconstructed using: (i) filtered back projection (FBP); (ii) IRT: adaptive statistical iterative reconstruction-50 (ASIR-50), ASIR-100 and model-based iterative reconstruction (MBIR); and (iii) standard (std) and bone kernel. Mean HU, CNR and average HU error after recalibration were determined. Each combination of protocols was compared using Friedman analysis of variance, followed by Dunn's multiple comparison test. Results: Pearson's sample correlation coefficients were all .0.99. Ultralow dose protocols using FBP showed errors of up to 273 HU. Std kernels had less HU variability than bone kernels. MBIR reduced the error value for the lowest dose protocol to 138 HU and retained the highest relative CNR. ASIR could not demonstrate significant advantages over FBP. Conclusions: Considering a potential dose reduction as low as 1.5% of a std protocol, ultralow dose protocols and IRT should be further tested for clinical dentomaxillofacial CT imaging. Advances in knowledge: HU as a surrogate for bone density may vary significantly in CT ultralow dose imaging. However, use of std kernels and MBIR technology reduce HU error values and may retain the highest CNR.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultralow dose dentomaxillofacial CT imaging and iterative reconstruction techniques: variability of Hounsfield units and contrast-to-noise ratio

Widmann

Bischel

Stratis

et al. 2016

BJR

View full text Add to dashboard Cite

show abstract

“…The consensus across the literature is that MDCT is the imaging modality of choice for adult patients with complex facial bone trauma . The liberal use of MDCT has become a concern because the ED exceeds that of plain radiography at an average of 1.5–2.9 mSv per facial bone CT compared to 0.02–0.1 mSv for x‐ray .…”

Section: Discussionmentioning

confidence: 99%

Dose reduction in CT imaging for facial bone trauma in adults: A narrative literature review

Hooper

Eccles

Milliken

et al. 2019

J of Medical Radiation Sci

View full text Add to dashboard Cite

Trauma to the facial area accounts for a significant number of admissions to the emergency department. Diagnostic imaging is almost always required, and is critical in determining patient management. Multi‐detector computed tomography (MDCT) appears consistently in the literature as the gold‐standard imaging modality for facial bones, but results in a high radiation dose to the patient. This makes the application and advancement of dose reduction and dose optimisation methods vital. This narrative review presents a critical analysis of the literature concerning diagnostic imaging of facial bone trauma, with an emphasis on dose reduction methods for MDCT. Databases including Pubmed, Medline, Web of Science and Scopus were used to investigate this topic, with the key words: facial bone trauma, computed tomography (CT) imaging and dose reduction. Exclusion criteria included studies on nasal bone fracturing, dental imaging, elective surgeries and paediatric imaging. The literature shows overwhelming support for MDCT, given its accuracy, efficiency and ease of operation. Noise reducing reconstruction algorithms show promise as a successful method of dose reduction in facial bone imaging. Investigations of more innovative techniques also appear within the literature, including diagnostic cone‐beam CT (CBCT), intraoperative CBCT and dual‐source CT (DSCT), but further research is required to confirm their clinical value.

show abstract

“…The results are confirmed by a cadaver study, which showed that the detection rate of maxillofacial fractures could not be improved by use of IRT. 10 When comparing the RP and FBP as the clinical reference with the other combinations, LD-I and II using MBIR were able to show comparable scores at a dose reduction of up to 93%.…”

mentioning

confidence: 93%

“…8,9 However, IRT images reportedly demonstrate an "oversmoothing" effect which may interfere with the need for a high spatial accuracy in dentomaxillofacial imaging. 8,10 Therefore, the aim of the study was to assess how IRT influences contrast and spatial resolution in ultralow-dose CT.…”

Section: Introductionmentioning

confidence: 99%

Spatial and contrast resolution of ultralow dose dentomaxillofacial CT imaging using iterative reconstruction technology

Widmann

Bischel

Stratis

et al. 2017

Dentomaxillofacial Radiology

View full text Add to dashboard Cite

Objectives: The objective of this study was to determine how iterative reconstruction technology (IRT) influences contrast and spatial resolution in ultralow-dose dentomaxillofacial CT imaging. Methods: A polymethyl methacrylate phantom with various inserts was scanned using a reference protocol (RP) at CT dose index volume 36.56 mGy, a sinus protocol at 18.28 mGy and ultralow-dose protocols (LD) at 4.17 mGy, 2.36 mGy, 0.99 mGy and 0.53 mGy. All data sets were reconstructed using filtered back projection (FBP) and the following IRTs: adaptive statistical iterative reconstructions (ASIRs) (ASIR-50, ASIR-100) and model-based iterative reconstruction (MBIR). Inserts containing line-pair patterns and contrast detail patterns for three different materials were scored by three observers. Observer agreement was analyzed using Cohen's kappa and difference in performance between the protocols and reconstruction was analyzed with Dunn's test at a 5 0.05. Results: Interobserver agreement was acceptable with a mean kappa value of 0.59. Compared with the RP using FBP, similar scores were achieved at 2.36 mGy using MBIR. MIBR reconstructions showed the highest noise suppression as well as good contrast even at the lowest doses. Overall, ASIR reconstructions did not outperform FBP. Conclusions: LD and MBIR at a dose reduction of .90% may show no significant differences in spatial and contrast resolution compared with an RP and FBP. Ultralow-dose CT and IRT should be further explored in clinical studies.

show abstract

Ultralow-dose computed tomography imaging for surgery of midfacial and orbital fractures using ASIR and MBIR

Cited by 30 publications

References 27 publications

Ultralow dose dentomaxillofacial CT imaging and iterative reconstruction techniques: variability of Hounsfield units and contrast-to-noise ratio

Ultralow dose dentomaxillofacial CT imaging and iterative reconstruction techniques: variability of Hounsfield units and contrast-to-noise ratio

Dose reduction in CT imaging for facial bone trauma in adults: A narrative literature review

Spatial and contrast resolution of ultralow dose dentomaxillofacial CT imaging using iterative reconstruction technology

Contact Info

Product

Resources

About