[Comparison of quality on digital X-ray devices with 3D-capability for ENT-clinical objectives in imaging of temporal bone and paranasal sinuses].
OBJECTIVE
Comparison of dosage and spatial resolution of digital X-Ray devices with 3D-capability in head and neck imaging.


METHODS
Three on-site X-Ray devices, a general purpose multi-slice CT (CT), a dedicated cone-beam CT (CBCT) and the CT-mode of a device for digital angiography (DSA) of the same generation were compared using paranasal sinus (PNS) and temporal bone imaging protocols. The radiation exposure was measured with a puncture measuring chamber on a CTDI head phantom as well as with chip-strate-dosimeters on an Alderson head phantom in the regions of the eyes and thyroid gland. By using the Alderson head phantom, the specific dosage of the X-Ray device with regard to different protocols was read out. For the assessment of the high-contrast resolution of the devices, images of a self-made phantom were qualitatively analysed by six observers.


RESULTS
The three devices showed marked variations in the dosage and spatial resolution depending on the protocol and/or modus. In both parameters, CBCT was superior to CT and DSA using standard protocols, with the difference being less obvious for the investigation with PNS.


CONCLUSIONS
For high-contrast investigations CBCT CT is a remarkable option in head and neck radiology.
Universitätsklinik und Poliklinik für Diagnostische Radiologie, Martin-Luther-Universität Halle-Wittenberg, Halle. manfred.knoergen@medizin.uni-halle.de
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Knörgen
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Brandt
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Kösling
D015901:Angiography, Digital Subtraction / Q000295:instrumentation*; D054893:Cone-Beam Computed Tomography / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation*; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D061330:Multidetector Computed Tomography / Q000295:instrumentation*; D010256:Paranasal Sinuses / Q000000981:diagnostic imaging*; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000295:instrumentation; D011874:Radiometry; D012680:Sensitivity and Specificity; D013679:Technology, Radiologic; D013701:Temporal Bone / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000592:standards*