What are the shooting conditions of spiral CT?

Spiral CT breaks through the design of traditional CT, adopts slip ring technology, and connects power cables and some signal lines with different metal rings in the fixed frame. X-ray tube and detector move with sliding brush and metal ring wire. The tube and detector are not limited by the length of the cable, and continuously rotate at a constant speed along the long axis of the human body. The scanning bed advances synchronously and uniformly (the traditional CT scanning bed is stationary during scanning), and the scanning trajectory spirals forward, thus completing the volume scanning quickly and continuously.

Classification of spiral ct

It is divided into single-slice spiral ct, double-slice spiral ct and multi-slice spiral ct.

Compared with conventional CT scanning, spiral CT scanning has the following advantages:

(1), hold your breath and scan the volume of the whole organ or a certain part, and there will be no omission of lesions.

② With the increase of scanning speed per unit time, motion artifacts are reduced, the utilization rate of contrast agent is improved, and the dosage of contrast agent is saved. It is reported that it can save about 50%.

(3) It can be reconstructed at will, with traceability, and there is no limit on the size of interlayer interval and the number of reconstructions.

④ Volume scanning improves the quality of multi-directional and three-dimensional reconstructed images.

Location of spiral ct examination:

Including brain, neck, chest (lung, mediastinum, chest wall and great vessels, pericardium), abdomen-epigastrium (liver, gallbladder, pancreas, spleen), retroperitoneal cavity, adrenal gland and kidney. Five senses (eye, ear temporal bone, throat, nose, sinus, temporomandibular joint), esophagus, gastrointestinal tract, pelvic cavity (bladder, uterus, fallopian tube, ovary, rectum, intestine B, vas deferens, prostate), spine, spinal cord, limbs, soft tissue, and ct intervention.