What is the difference between DR, CT and MRI? What are the advantages of each?

When going to the hospital to see a doctor, I often encounter such confusion: Is there any difference between similar-looking medical imaging equipment such as DR, CT, and MRI? Why do CT and MRI sometimes be used, and sometimes CT and MRI are needed for DR? Is it a random check? Or is the condition worsening? In fact, their working principles are different, each has its own division of labor, and its advantages are different. The editors of the following monitor manufacturers will take you one by one. Ltd.

DR:

DR (Digital Radiography) is a digital filming machine. An amorphous silicon flat panel detector is used to convert the X-ray information penetrating the human body into a digital signal, which is reconstructed into an image by a computer and subjected to a series of processing. The DR system is also one of the necessary "weapons" in major hospitals. It is often used to take pictures of human chest and bones, but also other parts such as abdomen, teeth, head, etc.

Advantage:

1. Read the film directly through the professional display, no need to develop the film, greatly save the film cost (except for patients with special needs).

2. After the DR upgrade, you can avoid all kinds of troubles such as taking the wrong film. The wrong film or the patient's body movement causes poor picture effect. The doctor can quickly see the effect and re-shoot.

DR

3. The display of bone structure, articular cartilage and soft tissue is better than traditional X-ray imaging, and quantitative analysis of mineral salt content; easy to display mediastinal structures such as blood vessels and trachea; the detection rate of nodular lesions is higher than Traditional X-ray imaging; it is superior to traditional X-ray images in observing calcium-containing lesions such as intestinal gas, pneumoperitoneum, and stones; tomography is superior to X-ray tomography; gastrointestinal double-contrast radiography is better than traditional X-ray images And on the intestinal mucosa folds, the digital image is better than traditional X-ray imaging.

4. The imaging process of the DR device is a digital imaging process.

CT:

CT (Computed Tomography) is a computerized tomography scan. Scan a certain thickness of a certain part of the human body with an X-ray beam. The detector receives the X-rays that pass through the layer and converts it into visible light. The photoelectric conversion becomes an electrical signal, and then an analog/digital converter (analog/ Digital converter) is converted to digital and input to computer for processing.

Advantage:

1. The scanning speed is fast, which solves the overlapping problem of X-ray projection imaging, makes the image clearer and the anatomical relationship is clearer;

2. Powerful post-processing functions (including: multi-planar reconstruction technology, curved surface reconstruction technology, 3D reconstruction technology, etc.) greatly improve the detection rate of lesions and the accuracy of diagnosis. Ltd.

MRI:

MRI (Magnetic Resonance Imaging) is also magnetic resonance imaging. It is a new high-tech imaging inspection method in recent years.

Advantage:

1. MRI has no ionizing radiation damage to the human body;

2. MRI can obtain three-dimensional cross-sectional imaging without reconstruction to obtain multi-directional images;

3. The soft tissue structure is clearly displayed, and it is better than CT for the examination of the central nervous system, bladder, rectum, uterus, vagina, joints, and muscles.