Effect of number of projections on image quality of local CT

Daatselaar, A.N. van; Stelt, P F van der; Weenen, J.

doi:10.1259/dmfr/23496562

Cited by 37 publications

(18 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A further limitation of CBCT imaging is that structures outside the limited field of view (FOV) may produce density variability in the scanned volume and cause a decrease of image contrast. [14][15][16] Lastly, compared with MDCT, CBCT images are associated with increased noise and scatter radiation, 17 which result in less soft-tissue contrast resolution. 2,7,18 Therefore, it has been argued that CBCT is solely suitable for evaluating calcified structures such as bone or teeth, as CBCT provides images of highly contrasting structures well.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of linear intraoral measurements using cone beam CT and multidetector CT: a tale of two CTs

Patcas

Markic

Müller

et al. 2012

Dentomaxillofacial Radiology

View full text Add to dashboard Cite

Objectives:The aim was to compare the accuracy of linear bone measurements of cone beam CT (CBCT) with multidetector CT (MDCT) and validate intraoral soft-tissue measurements in CBCT. Methods: Comparable views of CBCT and MDCT were obtained from eight intact cadaveric heads. The anatomical positions of the gingival margin and the buccal alveolar bone ridge were determined. Image measurements (CBCT/MDCT) were performed upon multiplanar reformatted data sets and compared with the anatomical measurements; the number of non-assessable sites (NASs) was evaluated. Results: Radiological measurements were accurate with a mean difference from anatomical measurements of 0.14 mm (CBCT) and 0.23 mm (MDCT). These differences were statistically not significant, but the limits of agreement for bone measurements were broader in MDCT (21.35 mm; 1.82 mm) than in CBCT (20.93 mm; 1.21 mm). The limits of agreement for softtissue measurements in CBCT were smaller (20.77 mm; 1.07 mm), indicating a slightly higher accuracy. More NASs occurred in MDCT (14.5%) than in CBCT (8.3%). Conclusions: CBCT is slightly more reliable for linear measurements than MDCT and less affected by metal artefacts. CBCT accuracy of linear intraoral soft-tissue measurements is similar to the accuracy of bone measurements.

show abstract

Section: Introductionmentioning

confidence: 99%

Accuracy of linear intraoral measurements using cone beam CT and multidetector CT: a tale of two CTs

Patcas

Markic

Müller

et al. 2012

Dentomaxillofacial Radiology

View full text Add to dashboard Cite

show abstract

“…However, reducing the number of projections (180°in-stead of 360°) increases the noise level and inconsistencies in reconstructed images. 32,33 In our study, the optical density measurement was significantly affected by the number of projections in the Accuitomo whereas this option was not explicitly available in the NewTom.…”

Section: Discussionmentioning

confidence: 92%

Influence of cone beam CT scanning parameters on grey value measurements at an implant site

Parsa

Ibrahim²,

Hassan³

et al. 2013

Dentomaxillofacial Radiology

View full text Add to dashboard Cite

“…[1][2][3] However, CBCT images are associated with increased scatter and noise compared with MDCT images, which causes them to have relatively less contrast resolution, [1][2][3][4] and with CBCT devices with a limited field of view (FOV), structures outside the FOV were reported to cause further reduction in image contrast. 2,5,6 The relatively lower image contrast of CBCT images reportedly affects low-contrast resolution but does not limit high-contrast resolution, which is the contrast required in implant site assessment. 1,2,7 Three studies have compared the accuracy of MDCT and CBCT in the assessment of implant site dimensions.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the accuracy and reliability of multidetector computed tomography and cone beam computed tomography in the assessment of dental implant site dimensions

Al-Ekrish¹,

Ekram²

2011

Dentomaxillofacial Radiology

117

View full text Add to dashboard Cite

Objectives: The aim of this study was to investigate the accuracy and reliability of linear measurements of edentulous ridges recorded from 16-row multidetector CT (MDCT) images and cone beam CT (CBCT) images acquired using a flat panel detector (FPD) with a large field of view (FOV), both independently and in comparison with each other. Methods: Edentulous areas of human dry skulls were marked with gutta-percha markers to standardize the plane of the transverse cross-sections and path of measurements. The skulls were imaged using a 16-row MDCT scanner and a CBCT device with a large FOV and a FPD. Ridge dimensions were recorded from reformatted sections by two observers and compared with measurements recorded directly from the bone. The measurement errors and intra and interexaminer reliability were calculated for each modality and compared with each other. Results: The overall mean of the absolute errors was 0.75 mm for MDCT and 0.49 mm for CBCT. The mean of the CBCT absolute errors was smaller than that of the MDCT absolute errors for the overall data, as well as for the site-specific data. The intraexaminer reliability score was 0.994 for MDCT and 0.995 for CBCT. The interexaminer reliability was 0.985 for MDCT and 0.958 for CBCT. Conclusions: Both MDCT and CBCT were associated with a clinically and statistically significant measurement error. CBCT measurements were significantly more accurate than those of MDCT. The measurements recorded from both modalities had a high inter and intraexaminer reliability. Accuracy of measurements was found to be more operator dependent with CBCT than with MDCT.

show abstract

Effect of number of projections on image quality of local CT

Cited by 37 publications

References 6 publications

Accuracy of linear intraoral measurements using cone beam CT and multidetector CT: a tale of two CTs

Accuracy of linear intraoral measurements using cone beam CT and multidetector CT: a tale of two CTs

Influence of cone beam CT scanning parameters on grey value measurements at an implant site

A comparative study of the accuracy and reliability of multidetector computed tomography and cone beam computed tomography in the assessment of dental implant site dimensions

Contact Info

Product

Resources

About