scholarly journals 3D cone-beam CT with a twin robotic x-ray system in elbow imaging: comparison of image quality to high-resolution multidetector CT

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Jan-Peter Grunz ◽  
Andreas Max Weng ◽  
Andreas Steven Kunz ◽  
Maike Veyhl-Wichmann ◽  
Rainer Schmitt ◽  
...  
Keyword(s):  
High Resolution ◽  
Image Quality ◽  
Multidetector Ct ◽  
Cone Beam Ct ◽  
Intraclass Correlation ◽  
Cone Beam ◽  
Single Measure ◽  
X Ray ◽  
Mdct Image ◽  
Significant Difference

Abstract Background Elbow imaging is challenging with conventional multidetector computed tomography (MDCT), while cone-beam CT (CBCT) provides superior options. We compared intra-individually CBCT versus MDCT image quality in cadaveric elbows. Methods A twin robotic x-ray system with new CBCT mode and a high-resolution clinical MDCT were compared in 16 cadaveric elbows. Both systems were operated with a dedicated low-dose (LD) protocol (equivalent volume CT dose index [CTDIvol(16 cm)] = 3.3 mGy) and a regular clinical scan dose (RD) protocol (CTDIvol(16 cm) = 13.8 mGy). Image quality was evaluated by two radiologists (R1 and R2) on a seven-point Likert scale, and estimation of signal intensity in cancellous bone was conducted. Wilcoxon signed-rank tests and intraclass correlation coefficient (ICC) statistics were used. Results The CBCT prototype provided superior subjective image quality compared to MDCT scans (for RD, p ≤ 0.004; for LD, p ≤ 0.001). Image quality was rated very good or excellent in 100% of the cases by both readers for RD CBCT, 100% (R1) and 93.8% (R2) for LD CBCT, 62.6% and 43.8% for RD MDCT, and 0.0% and 0.0% for LD MDCT. Single-measure ICC was 0.95 (95% confidence interval 0.91–0.97; p < 0.001). Software-based assessment supported subjective findings with less “undecided” pixels in CBCT than dose-equivalent MDCT (p < 0.001). No significant difference was found between LD CBCT and RD MDCT. Conclusions In cadaveric elbow studies, the tested cone-beam CT prototype delivered superior image quality compared to high-end multidetector CT and showed a potential for considerable dose reduction.

3D cone-beam CT of the ankle using a novel twin robotic X-ray system: Assessment of image quality and radiation dose

2019 ◽  
Vol 119 ◽  
pp. 108659 ◽  
Author(s):  
Jan-Peter Grunz ◽  
Andreas Steven Kunz ◽  
Carsten Herbert Gietzen ◽  
Andreas Max Weng ◽  
Maike Veyhl-Wichmann ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
X Ray ◽  
System Assessment

Achieving high-resolution soft-tissue imaging with cone-beam CT: a two-pronged approach for modulation of x-ray fluence and detector gain

2005 ◽  
Author(s):  
S. A. Graham ◽  
J. H. Siewerdsen ◽  
D. J. Moseley ◽  
H. Keller ◽  
N. A. Shkumat ◽  
...  
Keyword(s):  
High Resolution ◽  
Soft Tissue ◽  
Cone Beam Ct ◽  
Tissue Imaging ◽  
Cone Beam ◽  
X Ray

Multifunctional X-Ray System for Cone Beam CT Imaging of the Wrist: Evaluation of Image Quality and Radiation Dose

2020 ◽  
Author(s):  
Jan-Peter Grunz ◽  
Carsten Herbert Gietzen ◽  
Andreas Steven Kunz ◽  
Maike Veyhl-Wichmann ◽  
Süleyman Ergün ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Cone Beam Ct ◽  
Ct Imaging ◽  
Cone Beam ◽  
X Ray

Flat Panel Cone Beam Computed Tomography of the Sinuses

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P77-P78
Author(s):  
Richard A Zoumalan ◽  
Kathryn Shouyee Yung ◽  
Edwin Wang ◽  
Richard A Lebowitz ◽  
Joseph B Jacobs
Keyword(s):  
Image Quality ◽  
Ct Scan ◽  
Low Dose ◽  
Multidetector Ct ◽  
Imaging Modality ◽  
Cone Beam Ct ◽  
Image Noise ◽  
Cone Beam ◽  
High Dose ◽  
Flat Panel

Objective Flat panel cone beam CT is a relatively new technology that improves upon traditional multidetector CT scanners by generating images with greater spatial resolution at lower radiation doses. 1) Learn whether flat panel cone beam CT evaluation is an effective imaging modality for the sinuses. 2) Learn which doses of radiation provide quality evaluation of the sinuses while exposing the patient to the least amount of radiation. Methods In 2007, a panel consisting of neuroradiologists and otolaryngologists blindly reviewed images from flat panel sinus CTs (Xoran MiniCAT) of 11 live human subjects, each irradiated at all 3 different techniques (denoted as: low dose mAs=9.27, medium dose mAs = 18.41, high dose mAs=36.7) and rated the image quality of a pre-designated list of sinus anatomic structures. Techniques were compared in a pairwise manner using a Wilcoxon matched-pairs signed ranks test. Results Compared to the low dose technique CT scan, the high dose CT scan technique had significantly better image quality (P=.0029) and image noise (P=.0049). Similarly, the medium dose CT scan technique had significantly better image quality (P=.0020) and image noise (P = .0010) compared to the low dose technique. No difference in image quality and image noise existed between the medium and high dose techniques. No difference in visualization of 13 specific anatomic structures existed between any of the dose techniques. Conclusions Lower dose CT techniques achieved by flat panel cone beam CT may be an effective and safe alternative to traditional multidetector CT scanners. This imaging modality may help patients avoid unnecessary radiation to sensitive organs.

A meta-review using the ROBIS tool of effective doses in dental and maxillofacial cone beam CT

2021 ◽  
pp. 20210042
Author(s):  
Ayman Al-Okshi ◽  
Keith Horner ◽  
Madeleine Rohlin
Keyword(s):  
Image Quality ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Quality Of Reporting ◽  
Eligibility Criteria ◽  
Study Selection ◽  
Significant Difference ◽  
Meta Review ◽  
Effective Doses ◽  
Operating Potential

Objectives: To apply the ROBIS tool for assessment of risk of bias (RoB) in systematic reviews (SRs) in a meta-review on effective doses (EDs) in dental and maxillofacial cone beam CT. Methods: Three electronic databases and reference lists of included SRs were searched. Eligible SRs were classified as having low, high or unclear RoB. Findings of SRs were synthesised and data from primary studies combined to relate ED to field of view (FOV) and operating potential (kV). Results: Seven SRs were included: three displayed low RoB, three high and one had unclear RoB. Only one SR related ED to image quality. Deficiencies in reporting of eligibility criteria, study selection and synthesis of results in SRs were identified. Median ED for three FOV categories differed significantly (p < 0.001) but there was no significant difference in median ED between three operating potential groups. Conclusion: The ROBIS tool should have a role for meta-reviews of different aspects of radiology. The disappointing results for RoB might be remedied by developing standards to improve the quality of reporting of primary dosimetry studies and of SRs. There is a continuing need to perform dosimetry studies, although relating ED to image quality or diagnostic accuracy would add value. Advances in knowledge: This meta-review is the first in radiology to implement ROBIS to assess RoB in SRs of ED and identified that the trustworthiness of some SRs is questionable. The results underpin the importance of FOV dimensions as a determinant of ED in CBCT.

scholarly journals Simpler and effective radiological evaluations for modiolar proximity of a slim modiolar cochlear implant electrode

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Sang-Yeon Lee ◽  
Jin Hee Han ◽  
Marge Carandang ◽  
Yun Jung Bae ◽  
Byung Yoon Choi
Keyword(s):  
High Resolution ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Metal Artifact ◽  
Insertion Technique ◽  
X Ray ◽  
Discrimination Capability ◽  
Electrode Distance ◽  
Efficient Measurement ◽  
Conventional Ct

Abstract A new slim modiolar electrode (CI532/632) has been reported to ensure better modiolar proximity than conventional electrodes. Better modiolar proximity has been proposed to yield better electrode discrimination capability and potentially better speech outcomes, necessitating its efficient measurement. Currently, intracochlear positional index (ICPI), the most reliable indicator for evaluating modiolar proximity, has been measured exclusively through ‘metal artifact-less’ cone beam CT. However, popular use of this index is precluded due to lack of cone beam CT in many institutions. Thus, eyes are now on elucidation of easy-to-measure indicators of modiolar proximity derived from conventional CT, which is accessible in all centers. We observed that enhanced tomographic resolution significantly reduces partial volume artifacts, providing better visualization of modiolus-electrode distance. Aided by ultra-high kernel specification with high-resolution index, we developed a novel and easy-to-measure, conventional CT-specific indicator, “modified ICPI”, for evaluation of modiolar proximity. Further, we showed that it closely correlates with the previously proposed parameter of modiolar proximity, the spiral diameter, measured from post-insertion radiograph, reiterating the value of X-ray-based spiral diameter. Through this study, we have taken a step toward the stage of immediate visual feedback regarding modiolar proximity and changes in insertion technique intraoperatively, ensuring optimal modiolar proximity.

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