Imaging Definition and 155 Threads

There has been quite a few studies on the difference in the neuralanatomy pertaining to ADHD/ADD patients. Can we use this for a more objective test for ADD/ADHD on patients...

By this time next year I will have earned myself a masters degree in nuclear physics. My plan up till now was to do a second master in nuclear engineering, but the current climate in Europe and here in Belgium have put me off of that idea. This year I followed a course with the engineers on...

Hey all, I am brand new to the world of signal processing and radar, but I am trying to simulate a non-doppler imaging radar using pulses. I understand most of the concepts, including steering vectors and measuring distance by the time delay of a radar pulse. I am using a stationary antenna...

Hello! Do you know, or know where to find, the limits of imaging via waves, ie. let's say we have a biphase material, can we identify precisely the margin between phase? Or can we detect any kind of material? Thanks

I can't get my dsi pro II to produce a live view image. I either get a black screen or a grey screen with pepper dots. I concede the possibility of operator ignorance.

Does it indicate that the " spooky action(correlation)" even can be found in classical level, where entanglement is hardly can be built?

Homework Statement I have an image similar to the one given here with two types of material inside of it and I need to have at least one voxel in the image is entirely type B material (The smaller inside material). I am given all the dimensions on the material A and B but not told where...

Hey all. Looking at the following link http://starizona.com/acb/ccd/projectsfaint.aspx , the page says that limiting magnitude is mostly a function of aperture.(First paragraph in the Project Ideas section) I'm wondering why that is. Doesn't skyglow increase at the same rate as the light from...

What kind of advances have been made in this field (since I don't stay on top of it)? If I wanted to image, say, where my fluorinated drug is going within a rat, is it possible? NMR is inherently not a sensitive modality. Hydrogen is vastly more abundant in a living organism than fluorine...

Looking forward to all the applications this will be used in! http://www.popsci.com/technology/article/2012-03/new-microscope-dispenses-lenses-and-could-revolutionize-tiny-imaging

Folks, I'm self-taught and am currently trying to get up to date about the newest developments in field-emission microscopy and other methods of imaging sub-atomic structures. I'm able to follow (though just barely) Mikhailovskij et al.'s 2009 paper in Physical Review showing electron orbitals...

Hi, I came across this forum and decided to post this question. I am in my second year of undergraduate studies. My goal is to have a career in Medical Biophysics or Radiology, more specifically working in Medical Imaging. I was wondering how much physics is needed in general? I am currently...

OK, here's my first foray into the physics section, and I might as well start by giving you all a good indication of my overwhelming ignorance. Here's my questions: The images one sees around from colliders such as the LHC, you know, the curly lines showing particles going off in different...

Hi Im comparing PET scans and MRI scans and I've noticed that MRI s spatial resolution is 0.3-1mm while PET scans have a spatial resolution much larger, around 5-7mm. I was just wondering how these figures are calculated. I've looked up some formulae and all I could find was wikipedia...

I am currently in my last year of a B.S. Physics degree. I have an emphasis in medical physics and have spent the past year interning at the local cancer center's radiation oncology department. I love the field, but interning has made me realize that the patient interaction is not for me. I'd...

In ghost imaging the idler photons can be used to get an idea of an object (say shape) in the path of the signal photons. Is not the information of the shape of the object (in the path of the s-photon) being transmitted to p-photons (idlers) faster than light? (via entanglement) What am I...

... I recently graduated with a BA in physics with less than three months experience in physics research with a not so fantastic GPA. I don't want to go back to school and further my education because I don't want to continue to borrow money for loans to pay for college tuition . What kinds of...

In making comparisons on efficiency in acquired ambient light for imaging devices, whether they be CCD and CMOS cameras or reflective displays, it seems the factoring is always based on Red, Green and Blue as if those are the only bands of visible light. For example, in acquiring\reflecting the...

Hi All, Can anyone tell me the approximate starting salary of a medical physicist specializing in imaging? Also, how's the job market? Got my B.S. 15 yrs ago, but have actually been working in 3D graphics since then. I love graphics, so imaging seems interesting. I'm currently only...

Hi all, I have a question about the response of a cmos imaging sensor. The total exposure is defined as the irradiance * pixel area * exposure time and it can be varied by changing either the irradiance or the exposure time. Would the sensor response remain constant if measurements are taken...

Hi everyone, I am running agarose gels (1.5%, 100 V, 100 min) with the product of PCR-RFLP. My gel has 96 wells...48 on top and 48 on the bottom, so it is a rather large gel...300 ml by volume. I am having trouble getting clear, bright bands for the DNA in the lanes near the edges. It...

This is a very vague question, but I hope by asking it, we can pin down an answer eventually. In optics, there are such things as "Coherent Imaging" and "Incoherent Imaging." From what I understand, the degree of coherence has to do with the size of your Point Spread Function (PSF), a.k.a...

I'm sure I'm overlooking something simple here. I am trying to understand characteristic x-rays given off during photoelectric absorption of a photon. The energy from the photon is given to an inner orbital electron and the photon no longer exists. The electron uses the energy to escape, and...

I was asked how the artifical colored line now used in pro football games to mark the first down line is placed behind players and other images. And could not. In other words, print overlays, say with team names and scores, block the underlying field images...but somehow the artifical first...

Since my fluorescent source it at the shop for repairs, I took the opportunity to set up a proper macro imaging setup. I saw the "Powers of 10" movie in school, maybe 1st or 2nd grade, and it had a lasting impact on my career choices as a scientist. So, I decided to take a series of images...

So my mind tends to wander, but I was thinking... since active/passive sonar is used to detect objects underwater, couldn't thermal imaging be used as well (in conjunction)? Isn't there any reason why we couldn't combine the two sensors into cooperatively working together to detect submarines...

Hello all, I have recently been taught the method of imagging with opposite point charges. The stereotypical example of a point charge above an infinit conducting plate comes fine but i can't grasp the sphere example. It is shown http://en.wikipedia.org/wiki/Method_of_image_charges" , I...

Can a thermal imaging camera detect a body that is cooler than the detector? Or does the temperature of the detector put an absolute floor on the temperatures of objects that can be detected? How do radiometers detect radiating bodies that are lower temperature than the radiometer? Or does...

Can a spy satellite see a person through a vertical window, i.e., with line of sight near the horizon?

Hoping to go into Medical Imaging in grad school. I have a coupleish years left of my undergrad in physics. My school doesn't offer any medical imaging classes was wondering if anyone teaches or has taken a course and could recommend a text for a little self study. Thanks.

I've been trying to massage my data into a usable form for a while now and thought I'd consult the brain trust. I have a triangular mesh that represents the surface of an embryo. I also have a (x,y,z,c) point cloud near that surface where c represents a protein concentration (proportional to...

What is the source of noises we hear during MRI imaging? Thanks!

I (the Royal I, that is to say: my wife) have heard about this new technique wherein they are using 3D imaging of facial planes to detect and diagnose autism. [I] am particularly interested in what features they are examining and what identifying differences they are interested in. I've been...

What's the use of X-ray with angestrom wavelengh in imaging? Do you know of any good source to study more about that?

I am doing a lab for my optics class. My group has chosen to set up a simple dark field imaging device using a HeNe laser. My question is this: what would be an easy sample to image? Something that is common and easy to find but that would also produce a nice dark field image?

A telescope takes an image of a distant terrestrial object,lets say a tree, and amplifies and broadens it; however i ask myself if is not posible to build with some combination of lenses an apparatus where you will see an image of the distant object as IF YOU WERE NEAR OR CLOSE TO IT, this app...

Hello, I am trying to understand the difference between Active IR and Passive Thermal Imaging. First, I'll start off with what I DO understand, and finish with what's confusing me: I understand that in Active IR, objects are illuminated with Near IR (NIR) light (695-1000 nm) and then...

how plausible is it to image a single molecule using low energy neutrons? I was thinking it might be possible to build something similar to an interference microscope in order to accomplish this however I'm not entirely sure. I was thinking of doing a little research project on the mechanics...

Hi, If every point in the image plane is convolved with the PSF, why is it that this is only obvious in certain cases? Take astronomical imaging: for images of bright point sources (e.g., the brightest stars), we see rings, spikes etc. Why do we not see these features for dimmer stars...

Hello, I am a newbie in AFM and do not have enough time to figure out the answer to a probably easy question: I need to image continuously, for several times without modifying the scan settings, a relatively flat sample (+/-3 or 4nm) and I notice the following: In CM, after a while, the...

I know that the bigger the telescope aperture, the more photons you can collect, and the fainter the objects you can see. I also know that the bigger the telescope, the smaller the diffraction disc of a point source imaged with it, and therefore the greater the angular resolution (i.e. the...

Hi everyone Currently I am reading through antenna imaging effect. I am aware of positive and negative imagaing (essentially the polarity of the antenna is constant/reversed depending on the antenna orientation) However the illustrative example my lecturer has given me has caused quite a...

Hello all, This I suppose this is probably 80% of an optics/ microscopy question, maybe only 20% of a biology question, but I thought that people in this section probably have the most experience with this sort of thing. I am using a setup than involves an objective lens suspended over a...

If I have a camera orbiting in space way above the Earth, and it has a diffraction limited resolution of 4.1*10^-7 m (diameter of airy disc), then how can I find out the corresponding value if the lens is supposed to take images of the Earth?

Hello. I can't understand some things in these two files attached with this thread. Firstly,in file "image 1",i don't know about the method of least sequares mentioned in equation 47. Secondly, in file "image 2",from where the equation 52 comes and how do we get the next equation 53. I...

I was wondering if it was possible to construct a certain device. There would be a speaker on one side of a wall generating a certain frequency, and on the other side a receiver that would give an image of what was in the wall, such as cabling, studs, etc. I'm sure the technology exists, but I...

There is more and more concern about quantum communication and quantum network, I have some questions that I keep thinking for a while: Could there be combination of the Network theory and Quantum theory? Babarasi put forward the former one about 10 years ago and got great success...

Imaging the distribution of dark matter--anyone want to expand on this? http://www.physorg.com/news85326859.html just posted a few minutes ago

Hey people, I'm currently finished junior, and now looking for grad schools in medbio physics (preferably medical imaging, i.e. MR, X-ray). Can anyone suggest the best schools for this to apply? Thanks!

Hi I have to prepare a presentation on radio frequency imaging, applications and technical aspects etc. Unfortunately the uni library has closed and my google searches appear to be coming up rather thin (more RF coils in imagers than RF imaging). Does anyone know where I could find some...