# Questions tagged [biomedical-engineering]

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### 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 ...
187 views

### Polarity of a relative angle - Knee joint angle

I'm wondering if it's correct to write: $$\alpha = \theta_{lg} - \theta_{th}$$ EDIT: the theta angles are defined positive in counter-clock direcction, instead alpha in clockwise direction. My ...
39 views

### How can the air pressures exiting from a blower be adjusted?

During this covid-19, I was thinking about designing a low cost simple ventilator using a blower. There is a limit of the inspiratory and expiratory pressures, the inspiratory pressure being higher. ...
69 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 ...
1k 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. "...
36 views

### What is the amount airflow needed from Aquarium Air pump per minute to make a DIY CPAP?

I am trying to make DIY Bubble CPAP that can put a constant pressure on patient. I am using an Aquarium Oxygen pump as air source. The motor says 38L/Min in the spec. And by googling I found that an ...
9 views

### Classifying motor imagery using EEG data

I am an undergraduate student who is trying to classify motor imagery from EEG data! I have no experience working with EEG or any neuroscience background, I only have a very basic knowledge of how ...
21 views

### I want to test non woven fabrics to see if they are polypropylene, the lining material of N95 masks

A group of us are sewing face masks to prevent the spread of sputum. I've learned that the lining of an N95 mask is made of polypropylene. Polypropylene is also a common interfacing product for ...
99 views

### Why automakers are/should be making medical ventilators?

I am not very familiar with the mechanics of neither a car nor a medical ventilator. Considering global coronavirus pandemic and shortage of medical ventilators in many countries, I saw some news ...
18 views

### Is biological tissue a Dynamical System and a Nonlinear System?

I have biomedical data for analysis and I am using Genetic Algorithm for parameter estimation for the model of the data. As I read about the system identification, I saw terms like dynamical system. I ...
18 views

### how can I solve this error in c++: Exception Unhandled? [closed]

I am new in learning C++. I have used this code to show an image, but there is an error that I do not understand! This is the simple code: include iostream include conio.h include opencv2/core....
46 views

### Is it possible to power bio-chips with blood sugar?

Suppose I want to implant a bio-chip that consumes a lot of power into my body, for example, a full-fledged CPU, and I don't want to lug around a heavy battery like the ones used in pacemakers, is it ...
65 views

945 views

### Calculate elasticity of rubber balloon

I am developing a model for the respiratory system of a neonate (newborn child) for a BME project by using pressure/volume data of the lungs. To model these, I plan to use a rubber balloon. However. ...
89 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?
185 views

### Finding My, Mz in Complex/Asymmetrical Beam Bending

So I have done a three point loading test on a piece of bone. I have been able to obtain the Second Moments of Area $I_{xx}$, $I_{yy}$, $I_{zz}$. As well as the centroid. I also have the data from ...
2k views

### Convert Load Deformation (Extension) Data to Stress-Strain Curve

I am trying to manipulate some data that were obtained from a three point load experiment on a porcine tibia. I would like to obtain a stress-strain curve for the various specimens; however, the only ...
1k views

### What was that?! Quantifying the impact of a martial arts strike

Measuring things like a martial artist's strike can be challenging because it is a complex motion and common vernacular will use imprecise or incorrect terms. This question is an attempt to identify ...
2k views

### How to generate a synthetic infrared and red LED signal for SPO2 calculation

There are multiple algorithms out there for generating synthetic EKG signals (for test and validation of heart rate estimation algorithms). All you plug in is the desired heart rate, and the algorithm ...
2k views

### Why does blood pressure cuff size matter?

There are a number of sources that confirm blood pressure cuff size can have a significant impact upon the measured reading. (See 1, 2, 3, 4) The most succinct description I have seen is this: ...
95 views

### Implications of concatenating EEG signals

I am wondering about the mathematical implications of concatenating very small windows from different trials. All of the trials are the same size, and are for the same period of time after a stimuli. ...