Objetivos pedagógicos

After reading this chapter, you should be able:

  • To present the different fat signal suppression techniques
  • Describe the advantages and disadvantages of STIR sequences, fat saturation, selective excitation of water
  • Specify the different families of contrast agents
    • Explain their action on relaxation time and contrast
    • List their contraindications and main indications
  • Explain magnetization transfer and how it can improve background suppression

Pontos principais

Contrast agents

Contrast agent Principles Advantages / Applications Contraindications
 Adverse effects


Gadolinium chelates

 T1 reduction +++
 T2 reduction
Enhanced T1-weighted signal
Perfusion imaging
Well tolerated
Allergy, pregnancy
Renal/liver failure: Nephrogenic systemic fibrosis




Superparamagnetic iron oxides: T2* effect
SPIO: liver
USPIO: ganglion


Manganese chelates

 T1 effet
 Liver and biliary imaging



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