Download MRA NECK Dr. Mohamed Samieh MR ANGIOGRAPHY - O6U E

MRA NECK
Dr. Mohamed Samieh
MR ANGIOGRAPHY
• Angiography is a medical test
that helps physicians diagnose
and treat medical conditions
related to blood vessels.
MR ANGIOGRAPHY NECK
• MRA stands for Magnetic Resonance
Angiography. It is an MRI technique that specifically
evaluates vessels such as arteries.
• Carotid MRA evaluate the vessels of the neck
Carotid MRA are typically ordered for the
evaluation of stroke to detect blockages
and narrowing of the arteries in the neck
that ultimately supply the brain .
Symptoms related to stroke include:
1. weakness
2. sudden speech difficulties
3. confusion, erratic behavior
4. vertigo, dizziness
5. pain, tingling
numbness
• Carotid MRA can diagnose:
• Dissection - This refers to a tear in
the wall of the vessel.
• Aneurysms and Vascular Tumors Aneurysms are ballooning of the
vessels
• MRA of the carotids will evaluate:
• Internal Carotid Arteries
The carotid vessels arise from the aorta.
• Vereberal and Basilar Arteries
The basilar artery is made up by two vertebral
arteries
• Aortic Arch
• This is the large vessel which arises from
heart.
• Parts of the soft tissues of the neck are seen
in a Carotid MRA.
MRA NECK INDICATIONS
• Aneurysms and vascular tumors.
• narrowing and blockage of the vessels of
the neck.
• Arterio -venous malformation
• Stroke.
• Internal Carotid Artery Occlusion.
• Injury in the carotid artery.
MRA NECK CONTRAINDICATIONS
An implanted electronic device, such as a
1 - pacemaker
2- Metallic aneurysm clips, certain artificial
3 - heart valves and metallic hearing implants
4 - Certain vascular stents and certain metal
5 – patient with unstable neurology (make
exam under anesthesia)
PATIENT PREPARATION
1- Have the patient go to toilet
2- Explain the procedure to patient
3- Offer the patient ear protectors
4- Ask the [patient to remove any thing
containing metal
POSITION OF MRA NECK
1. Head first supine
2. Position the Neck in the Neck coil and
immobilise with cushions
3. Give cushions under the legs for extra
comfort
4. Centre the laser beam
localiser at the line
present on the coli
SUGGESTED PROTOCOLS , PARAMETERS
AND PLANNING
A three plane must be taken in the beginning to localise and plan the sequences.
Localizers are normally less than 25sec.
axial
sagittal
TR
TE
NEK
102
3
1
thickness
5
FOV
29 X 29
GAP
10 %
coronal
SLABs
No Slab
T2 FSE AXIAL NECK
Plan the axial slices on the sagittal and coronal plane axial slices is parallel to
intervertebral disk. Slices must be sufficient to cover area from the midbrain to
the arch of aorta . Check the positioning block in the other two planes .
TR
3700
TE
90
NEK thickness
4
7.5
FOV Freq DIR GAP
26 x 20
R > L 10 %
SLABs
anterior and inferior
2D TOF
TOF” relates to time of flight
•Time of flight angiography (TOF) is an MRI technique to
visualize flow within vessels, without the need to
administer contrast.
•With 2-D TOF, multiple thin imaging slices.
TR
TE
32 - 40 5-9
NEK thickness FOV
2
1
24 x 18
MATREIX
256x256
Freq DIR
A>P
GAP
10 %
SLABs
no
Example From Image Produce From 2D TOF
IVI IMAGE (REFORMAT ) TO PRODUCE ANGIO
IMAGES