TroubleshootingDASTroubleshootingTroubleshoot
Troubleshoot shifted CT number
Work Figure 5.4-20 against a shifted-CT-number artifact on the Aquilion 16 to trace the fault — through a tube-voltage scan check, wedge/slit optical alignment, a Converter-16 PWB slot-1 swap test, and a REF-detector/offset-acquisition check — down to one probable cause (source 2D201-065, §5.4, p.82).
Applies to
Aquilion 16 (TSX-101A) — data acquisition section (DAS), source volume 2D201-065, §5.4 shifted-CT-number fault-isolation flow (Figure 5.4-20, p.82). One of four image-artifact decision trees this chapter provides — see Related for the entry point (chapter introduction / symptom-to-cause matrix) and the sibling ring-image, streak-shower, and large-SD flows.
Personnel
1 technician · Intermediate — CT-number/image-artifact fault isolation on the DAS/detector chain: reading a tube-voltage scan result against a rated value, re-checking whether the CT-number shift actually recurs, judging wedge/slit optical alignment and normal operation, running a Converter-16 PWB slot-1 swap test and reading whether the defective channel moved, checking REF-detector output via the DCA, and reading offset-acquisition mean/SD targets (1000 ≤ mean ≤ 7000, SD ≤ 20 for ch 129-752) — escalating to trouble in the X-ray system, the wedge/slit assembly, a Converter-16 PWB, the main detector, or the REF detector (skill assessment derived from flow content — not an OEM-stated skill level).
Steps
13 steps
Source
2D201-065E*D p.82
Full step-by-step for Troubleshoot shifted CT number
All 13 steps are documented in the FSELIB Aquilion 16 (TSX-101A) service manual — re-authored, web-first, with the real figures from the source.
Open the full procedureRelated DAS guides
Acquire calibration data (NRA / air calibration)2 stepsCheck the DAS supply voltage (PCN1-PCN4)8 stepsRun the DCA offset data check (X-ray inhibit)7 stepsRun the DCA test-pattern check and read the Data Check menu3 stepsRun the DCA X-ray output check9 stepsDiagnose integrator-, gain-, and slice-thickness-dependent abnormalities4 steps
View all Aquilion 16 (TSX-101A) guidesSource: 2D201-065E*D p.82. Preview re-authored by FSELIB — the full procedure with figures and steps is in the paid service manual.