Trouble Shooting for 8ch Cardic coil low SNR

PROBLEM/SYMPTOM

When use 8-channel cardiac coil scanning, The image SNR not good. Find signal very low when use manual scanning.

ROOT CAUSE/SOLUTION

Integrated multicoil ASM mother board bad. (dynatron, IC: HC105)

TROUBLESHOOTING HISTORY/HINT

1. Use 8-channel cardiac coil run test SNR, all channel fail.

2. Use MCRT tools check 8-channel SNR, all channel pass. Then must the coil has problem.

3. Order new coil, but the problem same. Image also low SNR.

4. Check the module drive power and all the channel of STIF and IRF I/O board. The

8 channels are OK.

5. Replace the Integrated multicoil ASM the image of 8-channel cardiac normal.

6. Check the mother board, find HCT04(6反向器) and a dynatron bad.

Learning:

When we define the 8-channel fail place is coil side if use MCRT tools, we’d better check the 8-channel at other site.