How to interpret an MRI image from a technical point of view!

In clinical scanning, we will rationally optimize the scanning parameters and use some additional imaging options for imaging to better meet clinical needs and improve image quality
.
At the same time, this series of operations can basically be reflected from the parameter information in the image
.
In this issue, we take a look at what an image can tell us from a technical point of view
.

An MRI image, for diagnosis, is more concerned with the signal representation of each tissue in the image; For scanning technicians, attention is often paid to the more intuitive signal-to-noise ratio, contrast, resolution, artifacts and other indicators
in the image.

However, in order to further evaluate the image and understand more detailed operational details, we need to pay attention to more detailed parameters
in the image in addition to the above more intuitive indicators.
The interpretation of more parameters in the image can give us a deeper understanding
of the principle of MRI imaging and the mechanism of artifact formation.
Of course, there is a complex mechanism and deeper clinical significance behind each parameter, which will not be detailed
here.

The interpretation of detailed parameters in the image is more helpful for us to understand the sequence, optimize the parameters and analyze
the artifacts.
The following selects two models with more parameters in the image as examples, and through a brief introduction to the parameters, I hope that you can have the most basic understanding and understanding
of the parameters in the MRI image.

Identify basic information of the subject and system-related parameters
.

Some basic information can be known through the parameters in the upper right and upper left corners of the image:

In clinical scanning, due to the large scanning angle or special imaging position, it will lead to changes in the azimuth identification parameter information in the image
.
In actual scanning, if the scanning position changes, it is more important to pay close attention to the change
of azimuth identification parameters.
The interpretation of such parameters helps to accurately identify
the imaging orientation.

Learn about weight comparisons and basic scan parameters
for images.

From the parameters in the lower right and lower left corners of the image, it can be seen:

For images of some special imaging sequences, it is difficult to judge what kind of weight they are compared
without looking at the parameters.

Similarly, as shown in the figure above, if you don't give you other parameters, can you know why you get such an image?

Learn more about sweep parameters and the relationships between
them.

Focus on the imaging techniques
used in the imaging process.

Of course, there will be certain differences in parameter names, manifestations and labeling positions in the images of MRI equipment of different manufacturers, which will not be detailed
in this article.
In the daily scanning work, I hope that everyone can pay attention to the parameters in the image, and through the interpretation of the parameters, you can explore the unreasonableness of scanning from the parameters; to explore the formation mechanism of certain artifacts; Explore new ways to improve image quality and more
.

Actions that make you evaluate the quality of an image without giving scan parameters are "hooligan" behavior
.
If you want someone to help you see how the image you're scanning is and has any artifacts, be sure to bring the parameters with you
.