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Whole Body Imaging

Whole Body - PVA

Recommended Coils and Patient Position

The coils of choice for a whole body PVA study are the PVA coil (fi gure 3-342) together with the WIT Spine 8 and WIT Spine 12 coils.

1. Place the medium notched pad at the foot of the WIT mobile table (fi gure 3-343, left). Attach four straps to the Velcro® pads to the wings of each WIT Spine coil as shown in fi gure 3-343. Place the spine coil pad in the middle of the table, over the WIT Spine coils (fi gure 3-343, right).

Figure 3-342. The recommended coil for whole body PVA studies.

Medium notched pad

Figure 3-343. Table pad setup.

Spine coil pad

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2. Place the PVA coil bottom pad on the table as shown in fi gure 3-344.

3. Place the PVA bottom coil on the bottom pad as shown in fi gure 3-345. Make sure the coil cord is routed through the channel in the bottom pad as shown in fi gure 3-345. Plug the bottom coil into a table connector at the head of the table. Attach four straps (two on each side) to the Velcro® pads on the bottom coil as shown in fi gure 3-345.

PVA coilbottom pad

Figure 3-344. Placing the bottom pad on the table.

Route cord through channel

Figure 3-345. Placing the bottom coil on the bottom pad.

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4. The bottom pad and the bottom coil cord are equipped with Velcro® patches. To help eliminate stress on the bottom coil cord and to help keep the coil cord away from the patient, mate these patches together (fi gure 3-346).

5. Place the PVA coil top pad on top of the bottom coil as shown in fi gure 3-347.

Figure 3-346. Velcro patches on the bottom pad and bottom coil cord (left), and mated together (right).

Velcro patches

PVA coiltop pad

Figure 3-347. Placing the top pad on the bottom coil.

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6. Place a sheet over the table and pads. Place a pillow at the foot of the table to support the patient’s head. Place the patient on the table in the supine, feet-fi rst position as shown in fi gure 3-348.

7. Place the PVA top coil on the patient’s legs (fi gure 3-349, left). Secure the coil in place using the four Velcro® straps attached in a previous step. Attach the free end of the straps to the Velcro pads on the PVA top coil (fi gure 3-349, right). Plug the coil into a table connector at the head of the table.

Figure 3-348. Patient setup for a whole body PVA study.

Figure 3-349. Securing the PVA top coil in place.

PVA top coil

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8. Place the WIT Torso coil on the patient’s chest as shown in fi gure 3-350 (left). The WIT Torso coil must overlap the PVA top coil. Figure 3-350 (right) shows the optimal amount of overlap between the two coils . Secure the WIT Torso coil in place using the four Velcro® straps attached in a previous step. Attach the free end of the straps to the Velcro pads on the WIT Torso coil (fi gure 3-350, left). Wrap the coil cable with a pad to prevent direct cable-to-patient contact. Plug the coil into a table connector at the foot of the table.

9. Press the IN/UP button on the gantry control panel to bring the table up and advance the patient into the magnet. When the table is all the way up and attached to the table trolley, the laser light turns on. Refer to Chapter 8 of the Echelon OVAL How-to Manual for coil centering details.

10. Give the patient call bulb to the patient.

11. Press the AUTO button then the SET button on the gantry control panel. The tabletop automatically advances the patient to the magnet’s isocenter and stops. The imaging region centered under the lasers is now in the center of the magnetic fi eld. The longitudinal move counter display on the gantry will be zero.

Figure 3-350. Placing the WIT Torso coil in place (left), and optimal overlap between the coils (right).

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12. At the control console, click the Patient Registration launcher button on the Launcher toolbar to open the Patient Registration window (fi gure 3-351).

13. Complete the patient registration and open the Exam window to start scanning.

Figure 3-351. Launching the Patient Registration window.

Patient Registration

launcher button

Patient Registration

window

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14. Figure 3-352 demonstrates the results of the initial scanogram. If your scanogram does not match these results, please reposition the patient.

Tips and Tricks

• Make sure the WIT Torso coil cable does not directly contact the patient’s arms.

• Additional pads can be used around the patient’s feet for comfort.

• Keep the patient’s arms above their head for the entire scan.

• To help minimize patient warming and provide ventilation, turn the gantry fan on.

Figure 3-352. Completed scanograms.

Station 1

Station 2

Station 3

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Alternate Coils

For whole body PVA studies, there is no alternate coil. Use the PVA coil together with the WIT Spine 8 and WIT Spine 12 coils as described.