Known Problem in 20.1_IB1 Software, Resolved in 20.1_IB2 or 20.1_IB3 Software.
Symptom
Auto Prescan fails with RF Amplifier Duty Cycle Fault. see long description MR450 only. Auto Prescan fails with RF Amplifier Duty Cycle Fault. Auto Prescan fails and/or scanning is paused shortly after the scan begins with a message similar to the following in the Error Log: 2254205 Function: RF: RF Transmit PSD: Spin Echo Coil: HNS Head Scan: 638/3 SRFD2 RF Amplifier Duty Cycle Fault. Unblank duty cycle exceeds 60%.-> This problem generally occurs when using a Spin Echo sequence with Fat Sat pulse, TE = minimum, TR = Auto TR and Xres < 384. Workaround: Observe the value reported on the UI in the Auto TR field. Modify this value by adding 15% and entering the new value in the TR field. Do not modify the number of slices. If problem persists, continually increase TR by 5% until fault no longer appears. An additional option is to increase the Xres to 384 lines or more. This will allow the user to increase resolution at the cost of lower SNR. For complete details refer to service note pages 2 and 3 in Resolution. PR#1759975 Fix: 20.1_IB2 FMI 60787
Error message
2254205 SRFD2 RF Amplifier Duty Cycle Fault. Unblank duty cycle exceeds 60% see long description 2254205 ERROR: EM_RF_SRFD2_ERROR_42 SRFD2 RF Amplifier Duty Cycle Fault. Unblank duty cycle exceeds 60%. Extended Error: Verify proper PSD is used. If PSD is not the problem, perform RF Amplifier Functional Check procedure for SRFD2. UNBLANK Pulse corrupted, check Tyme Board.
Applies to
- Models
- Discovery, Optima
- Product
- Discovery MR450 Also called DVMR. This product is compatible with 1.5T 20.1, 20.1_IB1, IB2, 21.0 and DV22.0 software systems only.
- Software
- 20.1_IB1 and IB2 This release of software is applicable to Discovery MR450 and Discovery MR750 systems. See Long Description 20.1_IB1 is the unified Discovery MR450 and Discovery MR750 software release. Known internally to engineering as "DVIB". This release of software is applicable to Discovery MR450 and Discovery MR750 systems. 20.1_IB2 is the upgrade (bug fixes) for IB1.
- Area
- MR
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