Hey, guys from Radiologando? Are you okay? We are here for another video on the channel.
And in today's video, I tell you the difference between MRI and CT. But, calm down, before starting the video, leave the like down there, which I know you always do. Oh, and if you haven't subscribed to the channel yet, why are you wasting your time?
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Without further ado, let's go to the video? Well, folks, the difference between MRI and tomography, it's not just in the name, basically, apparently, in the image to be produced, it's similar, but the whole process for image formation, characteristic of image reconstruction, is totally different . Magnetic resonance imaging, in turn, she works with non - ionizing radiation, with the physical principles of radio frequency waves and principle of magnetism.
In computed tomography, X-type radiation is used, that is, X-ray. In computed tomography, because it works with X-rays, it will have an X-ray tube. In MRI , there will not be an X-ray tube It's a totally different system , okay?
Another thing, the way of applying one and the other, will be totally different. For example, the magnetic resonance, it will have some characteristics, the most appropriate physical properties to study the soft parts of the human body, that is, soft tissues, such as muscles, abdominal region, ligament region, some joint regions , among other organs and other structures of the human body. Computed tomography, on the other hand, will better study the anatomical parts, such as bone, spine, the lung region.
So, the application mode between one and the other will vary directly to which the patient will be redirected, tomography and resonance are totally different techniques. Well, guys, basically, when you're going to do a tomography and an MRI, the equipment, it can look the same. As you can see here, look, a tomography equipment and a resonance equipment.
They are similar, right? OK, but they work in a different way . In authorized tomography, because we have an X-ray tube, we will work with ionizing radiation.
In nuclear magnetic resonance, we will work with non-ionizing radiation, that is, radio frequency waves that will be produced by the coils. So basically the difference between one and the other is that one has ionizing radiation and the other has no ionizing radiation. Which of the two could be a risk, which contains ionizing radiation.
Basically, MRI will not pose any risk to your health from using ionizing radiation. Another important feature. The CT scan takes approximately five to fifteen minutes, depending on the type of procedure you are going to perform.
In MRI, the exam time is a bit why? The fact of not working with ionizing radiation makes this process a little longer, that is, the examination in magnetic resonance then lasts approximately fifteen to forty minutes depending on the procedure also to be performed. Another very important feature between computed tomography and magnetic resonance, from the image production point of view, computed tomography only acquires images in the axial section, thus being able to reconstruct this same image in other sections, such as coronal and sagittal.
In magnetic resonance imaging, the acquisition of the initial image can be by any slice, that is, the initial acquisition can start, either by the axial slice, either by the coronal slice, or by the sagittal slice, regardless of the initial slice that you will acquire the images, then you can reconstruct in the same way for the other cuts. Since, in tomography, it always starts with the axial section, in magnetic resonance imaging, it can start with any section in relation to the human body, whether coronal, sagittal, or axial. Well, folks, there are some radiological exams that there is also a need for the application and use of contrast.
The contrast used in tomography is totally different from what is used in magnetic resonance imaging and vice versa. In tomography, generally, the contrast used is ionic and non-ionic contrast. And it is usually administered intravenously, depending on the type of procedure, as it can also be taken orally.
In magnetic resonance imaging, the two most common types of contrast are usually gadolinium and carbon dioxide. These are the specific contrasts to work with in relation to the MRI technique. Not to mention that, in tomography, the image will have a different nomenclature.
As with X-rays, we see radiopagus and radiolocente . On tomography, what approximates higher density is described as hyperattenuating. And the lower density is described as hypoattenuating.
In MRI, the density is described as hyper intense and the lower density hypo intense and in both, when there is no type of density, it is said as no signal. Detail, folks, for you who have already had a tomography or a resonance test or are going to do it or are going to work, there are also some characteristics in relation to the installation of the place. When you are going to perform a tomography procedure, basically the patient.
He will need to remove all metallic objects to be able to do the exam, but in the examination room there is no problem in keeping metallic objects. In the MRI, until you reach the examination room, there is a whole security apparatus. In each pass, in each sector that you are going to pass, it will contain these symbols here, look.
That you, if yes, identify, you must inform the personnel regarding the procedure. Because if you have a metallic prosthesis , if you have a pacemaker, if you have an aneurysm clip that is basically attracted by the principle of magnetism, you can never go through or enter an MRI room, as this can generate some kind of risk . So, inside the MRI cell , no object is metallic.
Most of the objects used there are diamagnetic or paramagnetic. And ferromagnetic, because if they're magnetic irons, they're going to be attracted by the magnet in relation to the MRI equipment . Not to mention that, due to the fact that it also works with radiofrequency waves, the resonance examination room cannot suffer any type of external interaction from other radiofrequency waves.
So, the room is completely acoustically coated, so as not to suffer any kind of alteration in relation to the image. Ah, Igor, so I mean that when I have an MRI scan , I can't use my cell phone. It's a curious point .
As the room is fully acoustically tiled , you will basically have no telephone signal inside the room. Not to mention the fact that the cell phone has points, some ferromagnetic plates, they can be attracted by the equipment. So, it is prohibited to use a cell phone inside the MRI exam room, not only to not offer any kind of risk, but also not to hinder the production of the image during the acquisition of the exam.
Well, guys, this was another Radiologando video and, of course, I hope you enjoyed it. But, if you still have any questions, leave it here in the comments and the Radiologando team will answer you. Or, if you prefer, you can also go to my social networks, at Igor Prof, where in addition to following the posts, you can also log in closely with me.
OK, guys? Until the next video. Thanks.
Dende is bad for Valeu. Director, do I look good, director? Hey, boy.
Director does not give morale, not even here. Thanks. Then I'll leave, I'll talk again.
Well, guys, I have to say the same thing, but the diction didn't get tame, OK? We'll leave it here, right?
