X-ray machines are all large devices that can only image hard structures such as bone, unless a contrast-enhancing solution such as barium is present in the patient ... right? Well, no, not all of them. A new system developed by researchers at MIT and Massachusetts General Hospital is small enough to be considered portable, doesn't expose patients to as much radiation, and can image soft tissues in minute detail.
Ordinarily, X-ray machines emit beams of electromagnetic radiation from a single source. The experimental new machine, however, utilizes "a nanostructured surface with an array of tiny tips," each one of those micron-sized tips emitting its own beam of electrons. Those beams pass through a microstructured plate, and are converted into X-rays.
The resulting wider, more even spread of beams is what makes it possible for the machine to image soft tissues, without the need for contrast agents – such solutions take time to inject or administer orally, and some of them can be potentially harmful to the patient.
Additionally, unlike a conventional thermionic X-ray machine, the new device can be quickly turned on and off without needing time to heat up. This should minimize the amount of radiation received by the patient.
The current prototype is reportedly about the size of a shoebox, making it quite portable – production models are expected to be even smaller. This means that they could be used in the field for things like inspecting the integrity of composite materials, or checking carry-on baggage at airports.
According to senior researcher Luis Velásquez-García, the system "could potentially improve the resolution of X-ray imagery by a factor of 100 with hardware that costs orders of magnitude less." The technology still needs to be developed for two to three years, however, with commercialization taking a few years longer.
Source: MIT
Correct! Mammography has been around for decades with the purpose of imaging only soft tissues.
The amount of radiation received by the patien doesn´t depend on the time to "heat up the tube" that amount greatly depends on the energy of the beam, this is the higher the Kv, the lower the radiation absorved by the patient. Low Kv radiography such as mamography (soft tissue) implies a grater dose of radiation in the patient.
The radiation absorved by the patient´s tissue is what it makes possible a contrast in the image at the captor device ( film, solid state detector etc). if there were no x rays absorved by the tissue then there will be no image ( no contrast)
This device would improve the efficiency of x ray production, which is around 1% in the conventional tubes, this is 99% heat , 1% X rays.
This device is to x ray tubes what leds are to thermoluminiscent devices. They are much more efficient then the size shrinks a lot
The final X rays are the same, but I understand that are very similar to low energy X rays, allowing to get contrast in soft tissue.
And then of course CT uses x ray, so wouldn't this pose a drastic improvement for that as well?
(The most absurd part of this comment is the fact that I used to be a radiologist.)