In fluoroscopic triggering, the full bolus of contrast is administered and fluoroscopic-like images of the area of interest are obtained, and when the bolus is detected within the vessel, the technologist can trigger scan acquisition.
A real-time bolus tracking method was used to trigger scan initiation.
Thus, the main goal for MSCT coronary angiography in the near future must be to further reduce radiation exposure for instance by tube current modulation [32], [33] or prospectively triggered scanning using 256-slice CT [34] to reduce the cancer-inducing risk of this examination and thus make the test more acceptable to patients.
Respiratory triggered scanning improves SNR, but at the expense of an approximately threefold increase in scanning time.
Despite the above-mentioned breakthroughs in DWI, breathhold or respiratory triggered scanning was still considered necessary since it was widely accepted that respiratory motion was an impediment for DWI of (moving) visceral organs [ 11– 15].
> -wrap-foot> aFor imaging of the upper abdomen (including liver, spleen, and pancreas), a b-value of 500 s/mm can be applied, if necessary combined with respiratory triggered scanning bFor tumor detection in the prostate, b-values in the order of 1,500 2,000 s/mm can be applied Primary tumors and distant metastases exhibiting restricted diffusion can be identified with DWIBS.
The trigger and scan area for the calcium scoring scan was then set and the calcium scoring scan carried out with a 0.5-second rotation time at 37 mA and 130 kV with a pitch factor of 0.31 using retrospective ECG triggering.
Loss of connectivity triggers orphan scan, passive scan, and later association messages are exchanged, as shown in Figure 2. Following observations are made during this re-association of mobile end device after cluster change.
As well as dodgy links, it can also be triggered by scanning a malicious QR code.
IV contrast is injected at 4 5 cc/s (contrast volume = 4 5 cc × [delay time of the scanner from initiation of bolus trigger + scan duration]) [28].
