Frequently asked questions
Here you’ll find the most commonly asked clinical and technical questions.
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Category 1
How fast is the rapid processing time?
Rapid® processing takes 3 minutes or less. Results are immediately sent to PACS, email, and the Rapid mobile app.
Why is a relative CBF <30% used in the mismatch map?
Brain regions with CBF<30% of normal are likely to be irreversibly injured, yet unlikely to overcall the ischemic core volume. Rapid also provides a multi-threshold CBF map ranging from CBF. Learn More.
Is low CBF more reliable than low CBV for identifying tissue that is likely to be irreversibly injured?
What is the difference between Tmax and MTT maps?
A prolonged Tmax represents delayed arrival of the contrast bolus, while MTT represents the transit time of the contrast agent though the tissue.
What is the smallest lesion volume that RAPID can detect?
Rapid can visualize small lesions but only lesions greater than 3 ml are identified on the mismatch map.
Category 2
What happens when a patient has poor cardiac output?
If the scan duration is sufficiently long to capture the venous outflow, the Rapid maps will still be accurate.
What is the optimal scan duration for CT perfusion?
For CTP, the recommended scan time is at least 65 seconds. Learn More.
What does a warning mean?
Warnings generally indicate a problem with the contrast bolus or excessive patient motion.
Does truncation of the AIF curve matter?
Yes, the CBF and Tmax volumes can both be less accurate if there is truncation of the AIF/VOF curves.
How do you correct for patient motion or a poor AIF?
Rapid has substantial automated movement correction. However, if excessive patient motion leads to a poor AIF location being selected, it is easy to move the AIF on the Rapid web browser or to delete time-frames with excessive movement. RapidAI will reprocess the case and the new outputs can be sent to PACS if desired.
Can I change the thresholds?
Yes. The RAPID browser allows you to change thresholds and reprocess the case with the new parameters.
How can I access the advanced clinical training videos?
For full access to our educational resources and training videos, please Contact Us
Category 5
Does RAPID work with any scanner manufacturer or vendor?
Yes! Rapid works with every scanner make and model. No post-processing workstations/packages are required from the scanner manufacturers.
What are the installation requirements for RAPID?
Rapid is installed on a single server (virtual or physical) within the hospital firewall. To configure the server, the RapidAI team uses remote access via Site2Site VPN tunnel, client-based VPN connection, or portal-based connection. For server specifications, please Contact Us
How fast is the RAPID installation?
We have a very efficient implementation workflow that requires minimal effort from our clients. We can usually take your team from the start of Rapid platform implementation to live, within 2 weeks.
Does RAPID come with its own workstation?
No, Rapid is located on a DICOM-in/DICOM-out server and does not have any client workstations.
What is the workflow between the scanner, RAPID and PACS?
Rapid is added as a node to your scanner(s) and your PACS is configured to receive images from the Rapid server. Images go from the scanner(s) via DICOM to the Rapid server and then via DICOM to PACS without altering your normal workflow.
Category 6
How do I access the RAPID processed images?
The Rapid results are immediately sent to PACS, email, and the Rapid mobile app.
Does the CT or MR technician need to initiate the RAPID processing?
No, Rapid is a fully automated software platform. Once the scan is complete, images can be auto-sent to Rapid for processing and sent to PACS, email, and the Rapid mobile app in 2 minutes or less.
How long does the RAPID server store the images?
The Rapid server automatically purges data, the frequency of which depends on the site. For site-specific inquiries about Rapid data storage, please Contact Us
How are RAPID upgrades handled?
Our installation and implementation teams will notify you of Rapid upgrades and will work with your IT group to schedule upgrade times that minimize any disruption to your clinical team.
Is there technical support for RAPID?
We have 24/7/365 support for all our customers worldwide.
RapidAI support hotline: 1-833-RAPIDAI (7274324) US only. For all other countries visit: rapidai.com/customer-support
RapidAI support email: support@rapidai.com
The hotline and email are open and monitored 24/7/365.