https://doi.org/10.4224/17712982
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Volotovskyy, Vyacheslav; Tomanek, Boguslaw
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July 06, 2010
Institute for Biodiagnostics
National Research Council Canada
For: Andrew Procca, IBD, Winnipeg
Technical report 009-VL-002
On 9.15 MHz solenoid head coil 26 cm ID
Vyacheslav Volotovskyy and Boguslaw Tomanek
This technical report includes: description of the coil (page 2) schematics of the coil (Fig. 1) photo of the coil (Fig. 2)
The solenoid volume coil is made of ¼” copper pipe. Four concentric rings (27 cm diameter) are connected in series to provide a solenoid structure. Capacitive matching networks are employed to connect resonator with an active T/R switch positioned inside the coil. Inner diameter of the solenoid resonator is 260 mm, outer diameter – 280 mm, total length – 225 mm. Empty solenoid Q is about 900. When loaded with a volunteer heads solenoid coil exhibits reduction in Q value down to 200.
.Active switching is provided through DC line. DC voltage of 2.5 V and current of 0.4 A are required to switch the coil from Rx mode into Tx mode. RF isolation values between Rx and Tx ports are 42 dB in Rx mode and 55 dB in Tx mode.
Fig.1. Schematics of the quadrature volume coil
D
C
r e
t u
r n
T
x
R
x
D
C
D
C
r e
t u
r n
c
2
c
2
c
1
c
3
c
4
L
1
L
2
D
C
1
D
C
r e
t u
r n
2
D
C
2
D
C
r e
t u
r n
1
R
1
R
2
C
o
i l c
o
d
e
c
m
c
t
c
m
c
5
c
t
c
c
Coil schematics. Component values are as followed.
C=Ct: 220 pF 2500 VDC; Cm: 68 pF 2500 VDC; C1: 5100 pF 50 VDC; C2: 92 pF 500 VDC; C3: 390 pF 500 VDC; C4: 390 pF 200 VDC; C5: 5200 pF 2500 VDC; L1: 1 μH; L2: 3.9 μH; D: UM9415SM; R1: 150 Ohm, R2: 1300 Ohm.
