Methods: MRT.
MRI has become the imaging method of choice in special regions of the head and neck (e.g. nasopharynx, oropharynx, oral cavity, floor of the mouth). Superconducting MR-equipment with field strengths of 1.0-1.5 T are appropriate for the evaluation of the head and neck region. Signal acquisition is optimal with circular polarized head coils or with specially designed surface coils; the body coil is insufficient.When imaging tumors we need T1 contrast, T2 contrast and contrast medium information (enhancement information). For the T1 contrast T1-spin-echo is and remains the best sequence. For T2-contast T2 turbo-spin-echo with fat suppression has replaced the T2 spin-echo sequences because it is faster and shows good contrast between tumor and saturated fat tissue. Fat saturated T1 turbo-spin-echo enables best tissue contrast after Gd-DTPA application.
Lenz
M
M
Department of Diagnostic Radiology, Univerity Erlangen-Nuernberg, Maximiliansplatz 1, D-91054, Erlangen, Germany. lenz@idr.med.uni-erlangen.de
Greess
H
H
Dobritz
M
M
Kersting-Sommerhoff
B
B
D003287:Contrast Media; D004487:Edema / Q000175:diagnosis; D019786:Gadolinium DTPA; D017408:Guidelines as Topic; D006258:Head and Neck Neoplasms / Q000175:diagnosis*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D013997:Time Factors
D003287:Contrast Media; D019786:Gadolinium DTPA