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3d x ray scanning image
marshyanke
I know that a spiral produces thinner slices and perhaps in more detail, I am not really sure? I would like to better understand the science behind it? Also, could you respond with some understanding of MRI and Doppler scans as well? Could you provide some of the history of the above mentioned diagnostic tests? Thank you.
Answer
Computed tomography (CT), originally known as computed axial tomography (CAT or CT scan) and body section roentgenography, is a medical imaging method employing tomography where digital geometry processing is used to generate a three-dimensional image of the internals of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. The word "tomography" is derived from the Greek tomos (slice) and graphia (to write). CT produces a volume of data which can be manipulated, through a process known as windowing, in order to demonstrate various structures based on their ability to block the X-ray beam. Although historically (see below) the images generated were in the axial or transverse plane (orthogonal to the long axis of the body), modern scanners allow this volume of data to be reformatted in various planes or even as volumetric (3D) representations of structures.
Spiral CT scanning is just a new and advanced from of CT scanning: This is a newer type of CT scan, also known as a 'helical' CT scan. It is faster than a standard CT scan and gives an even more detailed picture of your organs and tissues, including blood vessels. This can make it useful for picking up very small tumours. It's called a spiral scan because the X-ray beam rotates around you during the scan in a spiral shape. This gives the radiographers a continuous picture, with no possible gaps between the 'slices' of the scan.
Computed tomography (CT), originally known as computed axial tomography (CAT or CT scan) and body section roentgenography, is a medical imaging method employing tomography where digital geometry processing is used to generate a three-dimensional image of the internals of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. The word "tomography" is derived from the Greek tomos (slice) and graphia (to write). CT produces a volume of data which can be manipulated, through a process known as windowing, in order to demonstrate various structures based on their ability to block the X-ray beam. Although historically (see below) the images generated were in the axial or transverse plane (orthogonal to the long axis of the body), modern scanners allow this volume of data to be reformatted in various planes or even as volumetric (3D) representations of structures.
Spiral CT scanning is just a new and advanced from of CT scanning: This is a newer type of CT scan, also known as a 'helical' CT scan. It is faster than a standard CT scan and gives an even more detailed picture of your organs and tissues, including blood vessels. This can make it useful for picking up very small tumours. It's called a spiral scan because the X-ray beam rotates around you during the scan in a spiral shape. This gives the radiographers a continuous picture, with no possible gaps between the 'slices' of the scan.
What is an "MRI, CAT Scan, and X-Ray: and are any of these three that I mentioned damaging?
Liberachi
Hello. What is the difference between these three that I mentioned above and are any of these damaging to the body, if so how? Which one of these is less damaging and more damaging and why? Please explain. Thanks.
Answer
MRI stands for magnetic resonance imaging. An MRI scan uses a strong magnetic field and radio waves to create pictures on a computer of tissues, organs and other structures inside your body. An MRI scan can create clear pictures of most parts of the body. So it is useful for all sorts of reasons where other tests (such as X-rays) do not give enough information required. It is commonly used to get detailed pictures of the brain and spinal cord, to detect abnormalities and tumours. Even torn ligaments around joints can be detected by an MRI scan. So, it is being used more and more following sports injuries. It is safe and painless.
CAT stands for Computerized Axial Tomography. The pictures are obtained by differences in X-ray absorption -compared with conventional xrays these differences are very small allowing different shades of grey and distinction between different tissues e.g. between fat and soft tissues and between brain and cerebrospinal fluid. The difference is that there is better details, it is quicker than MRI scan and most systems can be scanned from the brain to the leg. CAT scans are the most damaging, as there is a high radiation risk.
An x-ray (radiograph) involves exposing a part of the body to a small dose of ionizing radiation to produce pictures of the inside of the body. X-rays are the oldest and most frequently used form of medical imaging. Bone xrays are the fastest and easiest way to assess broken bones, no radiations remains in a patients body after examination and they usually have no side effects. Compared to other scans they provide no info on musles, tendons and joints. They are harmless and painless.
An MRI may be more useful in identifying ligament tears and joint effusions in knee or shoulder injuries and in imaging the spine, because both the bones and the spinal cord can be evaluated. MRI can also detect a bone bruise when no crack is visible on x-ray images.
CT is being used widely to assess trauma patients in emergency departments. A CT scan can image fractures of ribs, bones as well as of the spine and 3D images can be made when appropriate to help diagnosis and treatment of the individual patient's condition.
Hope this helps! :)
MRI stands for magnetic resonance imaging. An MRI scan uses a strong magnetic field and radio waves to create pictures on a computer of tissues, organs and other structures inside your body. An MRI scan can create clear pictures of most parts of the body. So it is useful for all sorts of reasons where other tests (such as X-rays) do not give enough information required. It is commonly used to get detailed pictures of the brain and spinal cord, to detect abnormalities and tumours. Even torn ligaments around joints can be detected by an MRI scan. So, it is being used more and more following sports injuries. It is safe and painless.
CAT stands for Computerized Axial Tomography. The pictures are obtained by differences in X-ray absorption -compared with conventional xrays these differences are very small allowing different shades of grey and distinction between different tissues e.g. between fat and soft tissues and between brain and cerebrospinal fluid. The difference is that there is better details, it is quicker than MRI scan and most systems can be scanned from the brain to the leg. CAT scans are the most damaging, as there is a high radiation risk.
An x-ray (radiograph) involves exposing a part of the body to a small dose of ionizing radiation to produce pictures of the inside of the body. X-rays are the oldest and most frequently used form of medical imaging. Bone xrays are the fastest and easiest way to assess broken bones, no radiations remains in a patients body after examination and they usually have no side effects. Compared to other scans they provide no info on musles, tendons and joints. They are harmless and painless.
An MRI may be more useful in identifying ligament tears and joint effusions in knee or shoulder injuries and in imaging the spine, because both the bones and the spinal cord can be evaluated. MRI can also detect a bone bruise when no crack is visible on x-ray images.
CT is being used widely to assess trauma patients in emergency departments. A CT scan can image fractures of ribs, bones as well as of the spine and 3D images can be made when appropriate to help diagnosis and treatment of the individual patient's condition.
Hope this helps! :)
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