Figure 1.
Structure of TM010 mode cavity resonantor and operation foundations.
a: diagrammatic sketch of cavity resonantor. b: how the cavity aperture measured tooth. c: the cavity resonantor was assembled to a home-made in vivo spectrometer.
Figure 2.
Sketches of electromagnetic field configuration and surface current distribution of cylindrical TM010 mode cavity.
a:magnetic field H1 configuration. b:electric field E1 configuration. c:surface current flow distribution. d:coordinate system. The dashed rectangle in a, b and c refers to the measuring aperture position. e: Electric field E1 distribution in XY plane. f: Magnetic field H1 distribution in XY plane.
Figure 3.
The design of the coupling unit, coupling hole and aperture geometry.
a: the photo of coupling hole. b: The voltage reflection coefficient (scattering-matrix parameter S11) by computer simulation using coupling hole of different length. c: The resonant quality factor Q against different detection aperture width.
Table 1.
Some important parameters of TM010 mode cavity.
Figure 4.
Relative signal intensity of DPPH sample against microwave power (square root or power) and modulation amplitude.
The microwave power was the power generated by the microwave bridge. The modulation amplitude was that generated by the modulation coils in vacuum space.
Figure 5.
a:Teeth samples. b: spectra from 0–8 Gy irradiated tooth within 30 s.
Figure 6.
a: Dose response curve without volume adjustment. b: Dose response curve after volume adjustment.
Figure 7.
Application for in vivo monkey measurement (a) and acquired spectrum (b).
The measurement parameter were: radiation dose, 2 Gy; Magnet gap, 90 mm; microwave power, 10 mW; scan time, 100 seconds; modulation amplitude, 0.2 mT; time constant, 0.03 s; center field, 338 mT; scan magnetic field width, 10 mT.