Abstract

Purpose: The aim of this study was to evaluate the reproducibility of mineral density measurement expressed in Hounsfield Units (HU) using a phantom device with known mineral densities and the NewTom 3G Cone Beam Computerized Tomography (CBCT).

Materials and Methods: A phantom device made of 21 HA cylindrical disks with known densities was fabricated. The phantom was scanned in 6, 9, and 12 inch fields of view using a NewTom 3G CBCT. The scans were repeated at non-consecutive sessions. Volumetric data in each of the scans were formatted to DICOM images. HU values of the regions of interest were retrieved using a DICOM viewer. The reproducibility of HU values according to the settings available in acquiring CBCT images was evaluated.

Results: A wide range of HU values was observed in the six scans. The two sets of ITU values for each field view size were significantly different each other (p ≤ 0.01). In addition, an effect of the scan field of view on HU values assessing mineral densities was observed (p ≤ 0.001). The 6 inch and 12 inch field scans were significantly different from 9 inch scans.

Conclusions: The HU values may vary as a consequence of time of acquisition and be influenced by the size of field of view while assessing known mineral densities using the NewTom 3G CBCT.

KEY WORDS: Cone Beam Computerized Tomography, NewTom, bone density, classification of bone quality, hydroxyapatite phantom, Hounsfield Unit, dental implant. scan field of view.

LLU Discipline

Periodontics

Department

Periodontics

School

Graduate Studies

First Advisor

Max Crigger

Second Advisor

Joseph M. Caruso

Third Advisor

Bernard Gantes

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2007

Date (Title Page)

5-2007

Language

English

Library of Congress/MESH Subject Headings

Dental Implants; Tomography, X-Ray Computed; Bone Density; Tooth -- surgery

Type

Thesis

Page Count

ix; 29

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

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