Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

 Yes

 N/A

 N/A

Base of skull through apex

Arterial Phase

 N/A

N/A

N/A

N/A

Venous Phase

 N/A

N/A

N/A

N/A

Delayed Phase

 N/A

N/A

 N/A

N/A

Scan Comments:  The F/U shunt protocol is performed using a low dose sequential scan to limit patient exposure.  Isocentering and properly positioning the patient within the gantry is key to image quality and limiting the radiation dose. If the patient is unable to hold still for the 30 second duration of the exam a low dose spiral study can be performed instead to decrease the scan time. All scans are performed using the ALARA principle.

Technical Parameters

Parameters

kVp

120

Effective mAs

200

Care Dose Reference mAs

N/A

Time (Rotation)

1.0 sec (full)  3.5sec cycle time

Average Acquisition Time

29 sec

Collimation

24 x 1.2mm

Table Feed

28.5 mm

Scan Direction

caudocranial

Comments:  The F/U shunt protocol is performed using a low dose sequential scan to limit patient exposure.

Reconstruction Parameters

Soft Tissue

Bone

Thin

Slice Thickness

4.8mm

4.8mm

N/A

Reconstruction Spacing

4.8mm

4.8mm

N/A

Reconstruction Algorithm

H30s

H60s

N/A

Window Width and Level

100 / 30

2500/500

N/A

Reconstruction Comments: Proper patient positioning is key to avoid unnecessary exposure to the patient’s eyes.

Contrast Parameters

Parameters

Contrast Type

N/A

Contrast Volume

N/A

Saline Flush

N/A

Injection Rate

N/A

Oral Contrast

N/A

Contrast Volume

N/A

Comments: IV contrast is not necessary for this exam.

Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

 Yes

 N/A

 N/A

Base of skull through apex

Arterial Phase

 N/A

N/A

N/A

N/A

Venous Phase

 N/A

N/A

N/A

N/A

Delayed Phase

 N/A

N/A

 N/A

N/A

Scan Comments:  The F/U shunt protocol is performed using a low dose sequential scan to limit patient exposure.  Isocentering and properly positioning the patient within the gantry is key to image quality and limiting the radiation dose. If the patient is unable to hold still for the 30 second duration of the exam a low dose spiral study can be performed instead to decrease the scan time. All scans are performed using the ALARA principle.

Technical Parameters

Parameters

kVp

120

Effective mAs

200

Care Dose Reference mAs

N/A

Time (Rotation)

1.0 sec (full)  3.5sec cycle time

Average Acquisition Time

29 sec

Collimation

24 x 1.2mm

Table Feed

28.5 mm

Scan Direction

caudocranial

Comments:  The F/U shunt protocol is performed using a low dose sequential scan to limit patient exposure.

Reconstruction Parameters

Soft Tissue

Bone

Thin

Slice Thickness

4.8mm

4.8mm

N/A

Reconstruction Spacing

4.8mm

4.8mm

N/A

Reconstruction Algorithm

H30s

H60s

N/A

Window Width and Level

100 / 30

2500/500

N/A

Reconstruction Comments: Proper patient positioning is key to avoid unnecessary exposure to the patient’s eyes.

Contrast Parameters

Parameters

Contrast Type

N/A

Contrast Volume

N/A

Saline Flush

N/A

Injection Rate

N/A

Oral Contrast

N/A

Contrast Volume

N/A

Comments: IV contrast is not necessary for this exam.