Coils; Body Coil; Description; Quality Measurement - Siemens Healthineers MAGNETOM Sempra Operator's Manual

Area of application
Configuration
Functionality
MAGNETOM Sempra
Print No. M4-08006G.623.01.02.02
4

Coils

4.1

Body coil

4.1.1

Description

The main function of the Body coil is to generate a homogeneous RF
magnetic field for the excitation of nuclear spins.
As a receiver coil for MR signals, the Body coil is used only for survey
measurements because its signal-to-noise ratio is significantly lower
than that of local coils located close to the body.
The Body coil is the innermost shell of the three field-generating
components: magnet, gradient coil and RF transmitter coil. It is
permanently installed in the magnet.
The support tube of the Body coil functions as the inside lining of the
magnet bore. It has guide rails for the patient table and, together
with other components, is responsible for attenuating noise.
The Body coil functions as a transmitter coil during all measurements.
Exception: when using local transceiver coils.
As a transmitter coil, the Body coil (aided by resonant current loops)
produces an alternating magnetic field. The frequency of this
magnetic field corresponds to the operating frequency of the MR
system. The strength of the magnetic field is selected so that the
nuclear spins are deflected according to the requirements of the
selected MR measurement.
If the Body coil is not used as a receiver coil, the Body coil is detuned
for receiving. As a result, the body signals are optimally received by
all other transceiver coils without interference from the Body coil.
4.1.2

Quality measurement

1 Position the phantom holder 38 at the head end on the patient
table.
Coils 4
37