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Quality of preimplant low-dose tomography.

Artikel i vetenskaplig tidskrift
Författare Annika Ekestubbe
Kerstin Gröndahl
Hans-Göran Gröndahl
Publicerad i Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics
Volym 88
Nummer/häfte 6
Sidor 738-44
ISSN 1079-2104
Publiceringsår 1999
Publicerad vid Odontologiska institutionen
Sidor 738-44
Språk en
Länkar www.ncbi.nlm.nih.gov/entrez/query.f...
Ämnesord Adult, Aged, Dental Implantation, Female, Humans, Male, Mandible, radiography, Middle Aged, Observer Variation, Patient Care Planning, Quality Control, Radiation Dosage, Statistics, Nonparametric, Tomography, X-Ray Computed, instrumentation, methods, standards, statistics & numerical data
Ämneskategorier Radiologisk forskning

Sammanfattning

OBJECTIVES: The aim of this study was to test the influence of radiation dose on image quality in mandibular preimplant computed tomographic examinations and to compare the quality of computed and conventional spiral tomographic images. STUDY DESIGN: Cross-sectional images were obtained on 17 patients with conventional spiral tomography (Scanora technique) and reformatted computed tomography at 40 and 80 mAs. Observers graded the acceptability of images for implant planning and traced the contour of the mandibular body and canal. RESULTS: Conventional spiral tomographic images scored significantly higher than computed tomographic images whereas mean score differences between computed tomographic techniques were not statistically significant. Anatomic structures, in particular the mandibular canal, were more frequently untraceable in high-dose than in low-dose computed tomography but always traceable in conventional tomograms. CONCLUSION: Conventional spiral tomograms were subjectively preferred over computed tomographic images. For mandibular implant planning, computed tomography examinations can be performed with lower-than-standard mAs. Quantum noise seems to contribute to the visibility of anatomic structures in reformatted computed tomographic images.

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