Neuroradiology Techniques and Tools - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

58

Pages:

2
Author:

Mariam A.

Neuroradiology Techniques and Tools  The modalities used in neuroimaging include: o CT o MRI o Interventional therapies – angiography and interventional neuroradiology (INR) CT Basics  Large-scale x-ray – therefore significant radiation dose  Provides good anatomical detail e.g. bony detail  Density is measured in Housenfield units (HU) o Bone: more than 1000 HU o Soft tissues and water: 0 HU (poor soft tissue contrast) o Fat: -100 HU o Air: -1000 HU  Contrast is applied when there is: o History of malignancy/abscess o Upon first seizure experience o For vessels o Abnormal non-contrast CT results  Contraindications include allergy and raised creatinine levels  CT angiography can be used to view blood vessels  CT can be ‘windowed’ for certain densities i.e. certain tissue densities can be made more prominent for optimal viewing     The above image has been windowed to show the density of fat It can be seen that there is a lipoma Windowing technology is able to provide a greater degree of soft tissue contrast – still does not compare to MRI Atrophy of the brain tissue makes sulci appear more prominent MRI Basics  Involves a magnetic field and no radiation  Shows excellent definition of soft tissue e.g. grey and white matter differentiation  Offers multiplanar views and multiple sequences  Is slower than CT and has some significant contraindications e.g. pacemakers, metal devices etc.  The below images are MRI scans of the brain   It can be seen that the soft tissue contrast is much greater than CT Different sequences are useful in the diagnosis of certain pathologies e.g. T2 weighting for oedema

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