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SENSE Flex coils: applications and positioning

Application Tip
Teitsma, Loretta Philips Healthcare Philips Global
van den Heuvel, Martina Philips Healthcare Philips Global

This application tip provides information on the SENSE Flex coils: their applications and coil positioning.

Type of coil

The SENSE Flex coils are flexible coils consisting of two elements; each element is labelled with an identification number.

The SENSE Flex family

SENSE Flex-S and Q-Head coil Orbit examinationSENSE Flex-M coil Shoulder examinationSENSE Flex-L coil Pediatric abdominal examination
SENSE Flex-S and Q-Head coil
SENSE Flex-M coil
SENSE Flex-L coil
Orbit examination
Shoulder examination
Pediatric abdominal examination


The SENSE Flex coil is available in three sizes:


SENSE Flex-S coil (Small): 2 circular elements of 11 cm diameter (opening 8 cm)

Applications: TMJ, eyes, IAC, small joints (wrist), superficial vessels (carotid arteries), pediatric


SENSE Flex-M coil (Medium): 2 elliptical elements of 14 cm x 17 cm

Applications: Shoulder, single hip, knee, ankle, pediatric imaging, carotid arteries.


SENSE Flex-L coil (Large): 2 circular elements of 20 cm diameter (opening 17 cm)

Applications: Brain, brachial plexus, pediatric imaging, pelvis, thorax, prostate.


Note that the SENSE Flex-S coil is not available on 3.0T systems.

Coil positioning: general

  • Avoid skin-to-skin contacts creating current loops.
  • Keep sufficient distance between RF coil cables / interface box and patient's skin.
  • Keep RF cables straight - no loops.
  • Keep RF cables parallel to the main magnetic field.
  • Keep RF coil cables and ECG/VCG cable separated.
  • When combining RF coils, pay special attention to cable handling.
SENSE Flex coils - Positioning RF cables parallel to the main magnetic field.
SENSE Flex coils - Positioning
RF cables parallel to the main magnetic field.

To avoid coupling between the two elements

Positioning the coil, care must be taken to avoid "coupling" or "cross-talk" between the two elements. To avoid coupling:

  • Keep a minimum distance of approximately half the size of an element between the coil elements if they are positioned parallel.
  • Ensure that the coil elements do not touch if they are positioned next to each other. It is better if the coil elements overlap a few centimeters.
  • Ensure that the elements do not touch if they are positioned at an angle. Position one element slightly on the other instead.
  • Do not connect the coil until the patient is positioned in the bore. This makes coil handling easier.


SENSE Flex coils: Positioning Hints on how to position the two elements in order to avoid coupling
SENSE Flex coils: Positioning
Hints on how to position the two elements in order to avoid coupling

Coil positioning: if the coil is positioned at the opposite side of the Patient Support Control Panel

  • Cables between coil elements and the combiner box should be parallel to the bore's long axis. The rest of the coil (outside the magnet) can run in a curved route to the control panel.


  • Make sure there is a distance between cable and patient and between patient and combiner box (can be placed underneath the leg support).


More examples

SENSE Flex coils positioning: Coil at op
SENSE Flex coils positioning: Coil at op

Links to related documents

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Nov 25, 2004

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Application Tip
Achieva 1.5T, Achieva 3.0T, Achieva 3.0T X-series, Intera 1.0T, Intera 1.5T, Intera 3.0T
Release 1, Release 1 (FreeWave), Release 10, Release 11, Release 12, Release 2, Release 2 (FreeWave), Release 2.5, Release 2.6, Release 7, Release 8, Release 9
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Ankle, Elbow, Hip, IAC, Knee, Musculoskeletal, Neuro, Shoulder, Wrist

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