Medical Imaging Devices Power Requirement

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electrics

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Hello, I want to learn how much power a medical imaging device say linac, mri, x-ray etc would need in terms of wiring and power utility design?
I scanned some of the specs and could not find the needed wiring and power requirements .
Can I find a source for understanding the logic behind these devices?
 
electrics said:
Hello, I want to learn how much power a medical imaging device say linac, mri, x-ray etc would need in terms of wiring and power utility design
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That's pretty much the same as asking how much fuel a car, truck, boat, plane, etc... use. You would need to specify the particular manufacturer, model, etc... of the equipment to get an answer.

Roger
 
I agree with Roger. I've designed feeders for MRI installs. After two years they replace it with a new MRI that needs twice the power. Two years later, the power doubles again.
 
roger said:
That's pretty much the same as asking how much fuel a car, truck, boat, plane, etc... use. You would need to specify the particular manufacturer, model, etc... of the equipment to get an answer.

Roger
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what I want to learn is how we can find out the power installation needed by such a device. AS far as I got, these devices are officially shooting for verry very short durations. But I am not sure about long durational operation.Also I could not see any specs item which gives such a ready to use info . Can you help me to find the value for say S?emens primus linac ? Or if it is preferable for a GE Product?
AS you can guess this sizing issues are a bit unconventional for engineering subjects..
 
electrics said:
what I want to learn is how we can find out the power installation needed by such a device. AS far as I got, these devices are officially shooting for verry very short durations. But I am not sure about long durational operation.Also I could not see any specs item which gives such a ready to use info . Can you help me to find the value for say S?emens primus linac ? Or if it is preferable for a GE Product?
AS you can guess this sizing issues are a bit unconventional for engineering subjects..
Click to expand...
The only reliable source is the manufacturer, and I suspect the information and much more would be found in the installation documentation that accompanies the unit.

The beam on time for a Linac may be anywhere from seconds to minutes, but probably not as long as an hour.
For a standard x-ray, probably only seconds.
For a C-T or MRI scanner, it could easily be operating for 30 minutes or more continuously.
For a Linac, the power level will depend on the selected beam current and voltage.
(I just spent a few weeks sitting on a Varian PureBeam linac table every day.)
 
If memory serves me correctly, a linear accelerator may be calibrated every once in a while, when it will run at full power for 3 hours or more.

Standard X-ray is a fraction of a second. There are demand factors you may use in 517. I believe its 50% for the first unit.

I believe a MRI should be considered a continuous load.

C-T's are basically an xray unit - but it's more like taking an xray movie than a single photo. Every one I have ever seen lists a peak demand, and a continuous long term rating. I apply x-ray demand factors to the peak ratings, and a continuous load demand factor (1.25) to the continuous rating, and I make sure my distribution can handle both.

Normally, you should get a detailed site installation package from the vendor. That usually includes typical installation drawings, and specifications. Then they will follow up with site specific drawings. We use these to produce our construction drawings, which include connections to the facilities electrical distribution.

Some of these companies have these generic installation drawings available on-line. GE does. (But be careful - they may not be up to date, and there may be small differences in the equipment that make a big difference in the power consumed.)
 
You need to know power requirements of the specific unit being used to start with. Then as mentioned in only a few years it likely is replaced with another unit that will require more power.

x-ray machines are pretty short duration for the heaviest part of the load, but they may have pretty strict voltage requirements as well, so you may find what seems to be oversized transformers and conductors just to ensure there is not too much voltage drop during that few milliseconds of load.
 
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