Assignment 1: Procedure daily QC

  • Open the Excel file ‘logbook’ on a computer.
  • In the file there is some data available as an example. You can clean these lines if you want. Note: You can only clear the information in the ‘green’ blocks. The grey lines contain formulas to calculate the statistics. You cannot clear these formulas.  You can have a look at them to see how the results are calculated.

  • Insert the information on the meter and the reference source on the daily page. (the information of the source is used to calculate the actual activity).

  • Put the date, the hour, and the name of the tester in the logbook. Note that if you insert the date, the software automatically fills in the actual activity of the reference source.


Look at the instruction film about the daily quality control:

In this the different tests are performed that are described further on.

After looking at the instruction film, perform the tests yourself on your own equipment.

(Oh, one remark, the two lead bins along the meter are there just to make the meter reading visible on the film).

 

Background

Control if there is no activity near the meter. 

Choose the isotope of the calibration source on the meter.

Set the reading of the meter on ‘background’. If this is not possible, just note the actual reading.
If the reader is set on automatic background subtraction, the reading should be zero.

Put the results in the logbook

 

Battery

Select ‘battery’ of ‘High Voltage’ on the meter

Note the reading in the logbook. 

In general this reading should be higher than 150V and the reading should not vary more then 10% from day to day.

 

Constancy

Put, using tweezers, the reference source in the source holder and in the meter.

Note the meter reading in the logbook.  
The excel sheet will give you the deviation from the actual activity. The difference should be less then 5%

Now select the isotope you use the most on the meter over the day (i.e. Tc-99m).  Read again the meter.
Note this reading in the logbook.
The excel sheet calculates the proportion between the two readings. This gives you an idea of the stability of the reader. This proportion should be stable within 5% over the time. The last column gives you this indication.



Have a good look at the instruction films of the two other centers:


Questions:

  • What are the differences and similarities between the QC procedures in the three centers?

  • What parts of the test do you think are essential?

  • What parts do you think are less important? Why?

 

If you have at your institute a protocol for daily quality control:

  • What are the differences and what are the similarities with the protocol in this course?

  • Are there differences in the results of measurements in the protocol in the course and the one you perform in daily routine?

 

If you use an automatic daily quality program:

  • What are the differences between the tests of this automatic program and the tests you have performed now?

  • Are there differences in the results?

 

What is your opinion on performing a set of daily quality control tests?

 

Put your answers to these questions in the discussion forum of this lesson, so we can have a discussion on the theme with all participants.

 


Last modified: Monday, 11 March 2019, 5:57 AM