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Last Updated: 4/9/2002
These cases are typically performed on pediatric patients
and are often run and read by the pediatric radiologist.
Patients will usually have an IV placed for sedation.
Typically double dose IV Gadolinium contrast (*)
is used to obtain the MRA
(2cc/10 lb instead of 1cc/10 lb) (0.1 – 0.2 mmol/kg gd)
EKG leads
The protocol is variable, depending on the patient’s
history and the clinical question, and sequences are under body coil or
head coil (for small babies). The typical protocol is:
| Sequence |
Plane |
Comment |
Film # |
| DB Haste |
Ax & Cor |
Gated. |
2 |
| Cine GRE |
Ax & Cor |
Gated. 10-20 slices; 4-10mm;
Ax from above aortic arch to base of heart.
Coronal images from anterior to posterior to the descending aorta.
Under WIP-Cardiac function. TR 60; 23 beat (don’t use grid
tagging)
# of phases usu 7-15 based on heart rate (TR * phases < RR interval)
Acq time 24-35 sec using 2 acquisitions. |
2
(film 1st image of each cine) |
| 3D FLASH |
Cor |
1 measure. Use 3D FLASH 2b488 {fl3d_itn_2b488ykc:
NOT qfs} (System #2) or ITN 2b488 (System #1)
For pulmonary artery studies the goal is 9-15sec acquisition.
Otherwise, 15-24 sec for aortic studies (allows better resolution).
Minimum FOV; actual effective thickness 1-2mm. |
0 |
| Timing Run |
Ax |
Thru region of interest. Typically
level of PA also showing aorta.
Use 10% of the contrast dose up to 1cc and inject by power injector
at 2cc/sec(if IV and patient are large enough) followed by 10-20
cc saline at 2cc/sec or hand injection if patient and IV are too
small |
0 |
| 3D FLASH |
Cor |
2 measures with no gap. Contrast
at 2cc/sec with 20 cc saline flush or by hand if IV too small.
Use the standard timing formula. |
0 |
| MIP |
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Subtract if necessary. |
2 |
(*) The use of gadolinium contrast material for these
applications represents off-label usage in the U.S. Outside the U.S.,
please consult your country's regulations for local guidelines.
NOTE: These protocols apply to Siemens
Symphony (with Quantum gradients) and Sonata systems. While they reflect
the protocols used at NYU Medical Center, NYU is not responsible for their
application elsewhere.
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