Beuf, O.

Gillet, P.

Goebel, J.-C.

Grenier, D.

Perrier, A.-L.

Pinzano, A.

Roeder, E.

English

HAL Descartes

Design of a four-channel array coil for dual high-resolution rat knee MR Imaging

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Design of a four-channel array coil for dual
high-resolution rat knee MR Imaging
A.-L. Perrier, J.-C. Goebel, A. Pinzano, E. Roeder, P. Gillet, D. Grenier, O.
Beuf
To cite this version:
A.-L. Perrier, J.-C. Goebel, A. Pinzano, E. Roeder, P. Gillet, et al.. Design of a four-channel array
coil for dual high-resolution rat knee MR Imaging. ISMRM - Discovery, Innovation & Application -
Advancing MR for improved Health, Apr 2013, Salt Lake City, United States. pp.NA, 2013. ￿hal-
00842843￿
Design of a four-channel array coil for dual high-resolution 
rat knee MR Imaging
AL Perrier1, JC Goebel1, A Pinzano2, E Roeder2, P Gillet2, D Grenier1 and O Beuf1
anne-laure.perrier@univ-lyon1.fr
ISMRM, Salt Lake City, USA, 2013
[1] D. Gareis et al., Concepts M.R. Part B, M.R. Eng. 29B:20-27 (2006).
[2] M.A. Dieringer et al., JMRI 33:736-41 (2011).
[3] A.L. Perrier et al., IEEE Sensors Jour. 12:1801-08 (2012). 
☺ Validation of an equivalent electrical circuit of a four-channel coil array 
based on common conductor decoupling technique 
☺ Design of a four-channel surface coil array with a particular wave-like 
topology for simultaneous dual rat knees imaging at 300 MHz. 
☺ matching better than -30 dB 
☺ decoupling better than -17 dB between all element pairs 
☺ no additional low input impedance preamplifier 
☺ no additional capacitive network
☺ HR-MRI : Voxel size of 49x49x98 µm3 with a 1h22min acquisition time 
for both knee joints 
Perspectives
Four-channel transceiver coil array :
- mechanical variable capacitors 
- each channel phase and magnitude could be driven to achieve multi-
transmit.
1Université de Lyon, CREATIS; CNRS UMR 5220 ; INSERM U1044 ; INSA-Lyon; Université Lyon1; Villeurbanne, France
2PPIA, CNRS UMR 7561, Nancy Université, Vandoeuvre-lès-Nancy, France
Introduction
Conclusion
Background:
 multi-channel coils used 
☺ to improve Signal-to-Noise Ratio (SNR)
☺ to increase spatial and/or temporal image resolution 
 Recent decoupling techniques based on common conductor
☺ do not require additional preamplifier for the decoupling between 
elements 
☺ conception of two-channel surface transceiver coils (1-2) 
Objectives:
 To develop a topology of a four-channel coil array based on common 
conductor decoupling technique (3)
 To achieve simultaneous acquisition of both rat knee joints at 7T
Acknowledgements: This work was funded by grant ANR-09-BLANC-0150-01 and is conducted in the framework of the 
LabEX PRIMES ("Physics Radiobiology Medical Imaging and Simulation).
Results
S-parameters
-60
-50
-40
-30
-20
-10
0
260 270 280 290 300 310 320 330 340
S11
S12
S13
S14
S21
S22
S23
S24
S31
S32
S33
S34
S41
S42
S43
S44
Frequency (MHz)
Experimental configuration of MRI 
Material and method
 7T Bruker system 
- transmission: linear birdcage coil with 112 mm outer diameter and 
72 mm inner diameter
- receiver: the designed four-channel coil array 
- 3D FLASH sequence: 30° flip angle, 50ms TR, 3.6ms TE, 27.8kHz 
receiver bandwidth
Equivalent electrical circuit 
 
3 3 
2 2 1 1 1 
Loop 2 
 
Loop 1 
 
Loop 3 
 
Loop 4 
 
R 
Lc Lc 
Cc 
R 
Cd 
Ca 
Ce 
Ld 
Port 2 (50 Ω) 
 
Port 1 (50 Ω) 
 
Ca Ca Ca 
Port 3 (50 Ω) 
 
Port 4 (50 Ω) 
 
Lb 
Ld 
Cc 
R R Lb Ce 
Cd 
Lc 
Cc Cc 
Lc 
Ce 
Cd Ld 
Lb 
Lc 
Cc 
Cd Ld 
Lb Ce 
Circuit of the coil array:
•Substrate: RT/Duroid 5880 
•Copper: 35µm thickness
•diode PIN: DH80055
•Varicap: BB149  
 
57pF 57pF 56pF 56pF 
510pF 510pF 510pF 510pF 
33pF 43.1p
F 
59.3p
F 
43.1p
F 
33pF 
220pF 
220pF 
220pF 
220pF 
220pF 
220pF 
220pF 
220pF 
RF 1 RF 2 RF 3 RF 4 
DC DC DC DC DC DC 
DC DC DC DC 
14mm 15mm 
10mm 
11mm 
9mm 
4mm 
7mm 
6mm 
19mm 
Loop 1 Loop 2 Loop 3 Loop 4 
Ca Ca Ca Ca 
Ce Ce Ce PIN PIN 
Design 
HR-MRI
 circuit simulations 
 measurements 
Right Left
-60
-50
-40
-30
-20
-10
0
260 270 280 290 300 310 320 330 340
S11
S12
S13
S14
S23
Frequency (MHz)
, S22, S33, S44
, S21, S34, S43
, S31, S24, S42
, S41
, S32
La=Lb=Lc=10 nH
Cc=Cd=28.1 pF
R=1.1 Ω
Ca=4.5 pF
Ce=24.2 pF
|S|<-50 dB at 300 MHz
Q=26
Loop 1 2 3 4
Tuning (V)
Ce (pF)
-0.3
25
-1.3
16
-1.2
17
-0.3
24
Matching (V)
Ca (pF)
-9
6
-12.4
4
-12.2
4
-8.4
6
Q 42 40 41 43
Two cylindrical phantoms filled 
with saline water solution (NiSO4 
1.25 g/L and NaCl 5 g/L) to 
mimic loading of rat limbs
At 300 MHz
|Sii|<-30 dB|Sij|<-17 dB
 The application of the coil can be found at poster 5201: “Bio-integration 
assessment of rat knee cartilage repair using in vivo MRI at 7T”
Images from simultaneous imaging of both rat 
knee joints 
49x49x98µm3 voxel size; 1h22min scan time
Image of each 
individual channel 
on cylindrical 
phantoms
Loop 2
Loop 3
Loop 4
Loop 1
PIN diodes
Each rat leg 
is put into 
one cylinder 


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Design of a four-channel array coil for dual high-resolution rat knee MR Imaging

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