Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Philipp, MO; Funovics, MA; Mann, FA; Herneth, AM; Fuchsjaeger, M; Grabenwoeger, F; Lechner, G; Metz, VM.
Four-channel multidetector CT in facial fractures: Do we need 2 x 0.5 mm collimation?
AJR Am J Roentgenol. 2003; 180(6):1707-1713
Doi: 10.2214/ajr.180.6.1801707
Web of Science
PubMed
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FullText_MUG
- Co-Autor*innen der Med Uni Graz
- Fuchsjäger Michael
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- Abstract:
- OBJECTIVE: Our aim was to optimize acquisition protocols and multiplanar reformation algorithms for the evaluation of facial fractures using multidetector CT (MDCT) and to determine whether 2 x 0.5 mm collimation is necessary. MATERIALS AND METHODS: A cadaveric head with artificial blunt facial trauma was examined using a four-channel MDCT scanner. The influence of acquisition parameters (collimation, 2 x 0.5 mm, 4 x 1 mm, 4 x 2.5 mm; tube current, 120 mAs, 90 mAs, 60 mAs), image reconstruction algorithms (standard vs ultra-high-resolution modes; reconstructed slice thicknesses, 0.5 mm, 1 mm, 3 mm; increment, 0.3 mm, 0.6 mm, 1.5 mm), and reformation algorithms (slice thicknesses, 0.5 mm, 1 mm, 3 mm; overlap, 0.5 mm, 1 mm, 3 mm) on detectability of facial fractures in multiplanar reformations with MDCT was analyzed. RESULTS: Fracture detection was significantly higher with thin multiplanar reformations (0.5 and 0.5 mm, 1 and 0.5 mm, and 1 and 1 mm) (p < or = 0.014) acquired with 2 x 0.5 mm collimation (p < or = 0.046) in ultra-high-resolution mode (p < 0.0005) with 120 mAs (p < or = 0.025). Interobserver variability showed very good agreement (kappa > or = 0.942). Non-ultra-high-resolution mode, lower milliampere-seconds, and thick multiplanar reformations (3 and 0.5 mm, 3 and 1 mm, and 3 and 0.5 mm) showed significantly decreased fracture detectability. CONCLUSION: Although thin multiplanar reformations obtained from thin collimation (2 x 0.5 mm) are statistically superior for the detection of subtle fractures, 4 x 1 mm collimation is sufficient for routine diagnostic evaluation. Ultra-high-resolution mode with 120 mAs is mandatory for detection of clinically relevant fractures.
- Find related publications in this database (using NLM MeSH Indexing)
- Aged -
- Algorithms -
- Facial Bones - injuries Facial Bones - radiography
- Facial Injuries - radiography
- Female -
- Humans -
- Image Processing, Computer-Assisted -
- Observer Variation -
- Sensitivity and Specificity -
- Skull Fractures - radiography
- Tomography, X-Ray Computed -
- Trauma Severity Indices -