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information/bookings

Booking Information

This page contains information regarding calculating timings for MEG/MRI bookings. You should have gone through this process with an operator at the start of your project and/or during your pilot.

Information for users on actually making bookings can be found on the internal booking procedure pages.

Please note that time is booked in 15 minute blocks, so you will need to round up your estimated session length to the nearest 15 minutes (e.g. if the estimated time is 48 minutes, you will need to book a 1 hour slot).

Making sure you have allocated enough time for your study

Although non-invasive, MEG and MRI patient / subject setup is a very intricate and thus relatively time consuming process. As such, it is important that you understand that you will unfortunately not be able to carry out a complete hour of data acquisition if you only book an hour of time for your subject in the MEG and MRI suites.

Tables 1 and 2 below show a lookup table of the recommended amount of time you will have to book the MEG suite for and how we have arrived at these timings. These tables are designed to give you an idea of the amount of time that it will take for each of your subjects to undergo the screening, preparation and debriefing which are essential for us to guarantee that the results we are recording for you are as accurate as possible.

Tables 3 and 4 show figures for booking the MRI suite.

Once you know how long your acquisition time is (typically controlled by how long your stimulus delivery code runs for) and how many patients you intend to run, simply look up the "number of hours to be booked" corresponding to your requirements:

MEG Suite Bookings

Table 1:
meg_table1.png

Table 2:
meg_table2.png

MRI Suite Bookings

The following timings assume that the participant has been fully prepared and consented before entering the scan room. They should have had the experiment explained to them and the investigator should have completed the safety and consent forms with them - any contraindications highlighted during this time must be authorised at least one working day before the scan session; only Level 3 operators are able to authorise contraindications, and we cannot guarantee that one of these operators will be available at the time of your scan. Scans will not proceed without Level 3 authorisation if contraindications have been identified. At the start of the scan session, the scanner operators will go through the safety form with the participant. The form must be signed by the participant before scanning commences. This signed documentation represents the formal request for imaging which is a legal requirement.

Common issues which delay the onset of scanning and waste your valuable scanning time are:

  1. Late participant
  2. Paperwork incomplete
  3. Participant not prepared (e.g. make-up, hair-grips, jewellery, need changing, etc)
  4. Stimulus altered

The timing examples below assume a standard fMRI configuration within the GE scanner, which is:

  • 8 Channel brain coil
  • Standard projector/screen set up
  • 1 Stim PC
  • Response box
  • Emergency buzzer

Any study which requires a 'non standard' setup e.g. Audio stimulus, 16 Channel coil, Physiological monitoring etc. will require an additional 10 minutes for set up and return to standard configuration. If the set up is particularly complex, longer than 10 minutes may be required, this will be determined during pilot scanning.

Each scan sequence should be allocated approximately 2 minutes over the posted scan time to allow for system prescan procedures and operator interaction with the participant i.e. a 5 minute sequence should be allocated 7 minutes when calculating overall scan time.

Table 3: YNIC Full Structural

(N.B. this would be required for co-registration with MEG studies)

Example (YNIC Full structural)

Action

Posted time

Time required

Standard Preparation

5 mins

Localiser

30 secs

2 mins

Asset Cal

30 secs

2 mins

T1a

5 mins

7 mins

T2a

5:40 mins

7 mins

T2

1:20 mins

3 mins

Total

13 mins

26 min

So from the example above it is clear that although the scan timings for the YNIC full structural only add up to 13 minutes, the actual time taken to conduct the study and therefore the amount of time which must be booked is significantly longer.

Table 4: YNIC Standard fMRI Study

Example (Standard fMRI Study)

Action

Posted time

Time required

Standard Preparation

5 mins

Localiser

30 secs

2 mins

Asset Cal

30 secs

2 mins

Pulse Test

30 secs

2 mins

T1 Flair

3:30 mins

5 mins

fMRI 5 min

5 mins

7 mins

Total

10 mins

23 min

In this example, the study only has 10 minutes of 'scanning' time, but the scanner suite is occupied for 23 minutes.

Obviously if the participant does not have a pre-existing T1a an additional 7 minutes will be required to accommodate the extra scan.

When booking multiple participants there may be opportunities for efficiency savings e.g. much of the 5 minutes prep time can be saved if this activity is performed for the second participant whilst the first participant is still in the scanner. However, you should always discuss with the operator what time savings can be realistically achieved before making multiple bookings.

Interview Room Booking

The interview room in the MRI corridor can be booked. This facility may be used for interviewing subjects before MRI or MEG experiments. However, the room will not be able to be booked online. Bookings are made by filling in a time slot on the sheet on the door (please speak to reception if the calendar on the door is out-of-date). In exceptional circumstances when a YNiC User is unable to be present in YNiC to fill in this sheet themselves, they may contact support (support@ynic.york.ac.uk) who may be able to book time for them.