Questions tagged [medical-devices]

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1answer
87 views

How is the first image estimate generated in CT scan iterative reconstruction (IR)?

Background info: For decades CT scanners produced medical images from x-rays travelling through the tissues of the patient at different angles through analytical methods based on the Radon transform ...
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1answer
30 views

Pulse Oximetry, does the decimal matter?

I work in a sleep research lab. We have a couple of Masimo pulse oximeters that report pulse oximetry values in terms of integers (e.g. 90, 91, 92, etc.). Now our principle investigators used to use ...
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0answers
27 views

Why do modern MRI scanners use an axial static field?

Last night I was reading some fascinating history of the first full-body MRI scanner and noticed that it's fundamentally different from modern scanners in one particular way: the static B field is ...
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2answers
26 views

Measuring gas flow from a low-output device

My lab uses a home-built biomedical instrument that acts as a ventilator for test-subjects. In other words: our device combines nitrogen and oxygen gases and pumps them down the line at a specified ...
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2answers
45 views

Positron Emission Tomography: How to get from photon count to radioactivity?

What I have learned The detectors of the PET actually measure the photons, which are caused by the radioactive tracer injected into the patient. Then, with the help of backprojection, we get the ...
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0answers
41 views

How would an electromagnet function within an MRI? [closed]

For the purpose of this situation. Lets say there are 4 small electromagnets within a MRI. All of them activate at the same time. The entire setup is comprised up of non ferrous metals. The metals ...
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2answers
54 views

How many decibels does wind buffering reduce from ear muffs protection?

I have a hearing condition and need to wear ear muffs on my scooter. My muffs are 3M Peltor with a dB rating of 35dB. When riding my bike, the combined noise from the engine and the wind is about ...
2
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0answers
457 views

IV drip/flow rate controller design

I have a question about intravenous flow rate controllers, which are controlled using microprocessors. For example: I want to control the IV flow rate, the flow is in range from 0 to 300. So, I just ...
4
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1answer
854 views

How does a flexible endoscope turn?

By flexible endoscope I mean colonoscope, gastroscope, etc. From this video I can see that an endoscope can swivel its tip while in place, kind of like a periscope. But while moving axially, i.e. "...
3
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1answer
111 views

Could a medical ultrasound device be used for recording the topography of a small river?

I work as a research assistant in the field of water resources management. We build small scale physical models of rivers and make experiments with sediment. The model rivers are about 20m long and 3m ...
3
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3answers
83 views

Why is the jacket or sheath of fibre optic endoscopes always black?

Why is the jacket or sheath of fibre optic endoscopes always black? Is it just a convention, or is there a more logical explanation for this?
3
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1answer
778 views

What is the purpose and cause of disposable syringes being single use only?

What's the mechanism behind disposable syringes jamming? How do you prevent this from happening or reverse the effect? They are a lot cheaper. The problem is that once the syringe is pressed all the ...