What is the difference between CT examination and TC examination? Thank you

1. CT examination is also called computerized cross-sectional tomography. X-ray beams are irradiated from multiple directions along a selected slice level, the amount of transmitted X-rays is determined, and an image is reconstructed through a computer. This test is convenient, fast and safe. CT density resolution is high. Ordinary X-ray examination cannot distinguish the density of soft tissues such as blood vessels, muscles, fluids, and fats, but CT can distinguish them. It is very helpful to locate small tumors, such as tumors with a diameter of about 1 cm. Especially after using contrast agent to enhance the contrast, it will be clearer. It is more ideal for the detection of brain, liver, kidney, pancreas and pelvic tumors. However, the determination of the pathological nature of tumors is still not as accurate as pathological diagnosis.

Computed tomography (CT for short) is a product of the combination of computer and X-ray inspection technology

. It is a tomography device first successfully designed by British engineer Hounsfield in 1969. In 197

the British Society of Radiology first reported this result, and he and neuroradiologist Ambrose successfully applied it to the brain and obtained the first case of brain tumor. image. It was officially reported in the British Journal of Radiology in 1973 and attracted the attention of the medical community. It was hailed as the last leap in the era of radiological diagnosis since Roentgen discovered Roentgen rays in 1895.

. In 1974, Ledley successfully designed a whole-body CT device, which further expanded the scope of CT examinations and achieved greater benefits

. Therefore, Hounsfield and Cormark (American physicists who first suggested using X-ray scanning for image reconstruction in 1963 and proposed an accurate numerical calculation method) won the 1979 Nobel Prize in Medical Biology. In the past 20 years, due to the continuous updating and improvement of CT

devices, software and scanning technology, CT movies, CT angiography (CTA), ultra-high-speed

CT and high-resolution CT have appeared. Force CT, spiral CT, etc. CT can not only perform static observation of morphology, but also perform dynamic observation, thereby expanding the scope of application of CT and improving the accuracy and credibility of CT diagnosis. Spend. At present, CT has been popularized in developed countries

In large and small hospitals at all levels and even private clinics, there are more than 2,000 CT units in our country, and it is expected to be popularized in county-level hospitals in the near future

. CT has become an indispensable examination method in the field of imaging diagnosis

Hyperlipidemia is divided into the following types:

(1) Type I (hyperchylomicronemia). This type of patients is more common in teenagers. Patients under 10 years old often have acute abdominal pain attacks after eating high-fat meals. Rash-like xanthomas appear earlier on the buttocks, back, knees, and elbows. Moderate liver and spleen enlargement changes with changes in triacylglycerol. When triacylglycerol is greater than 22 mmol/L, hyperlipidemia in the retina appears. This type is extremely rare.

(2) Type IIa (type IIa hypercholesterolemia). Eyelid xanthomas, tendon xanthomas, subcutaneous nodular xanthomas, juvenile keratitis, early onset (<40 years old) atherosclerosis, and rapid development. This type is common.

(3) Type III (wide B-lipoproteinemia). Flat xanthomas, tendon xanthoma, nodular rash-like xanthoma, premature coronary artery and peripheral atherosclerosis often appear at the age of 30-40 years. The disease progresses rapidly and is often accompanied by obesity. This type is less common.

(4) Type IV (hyperpre-B-lipoproteinemia) is common in patients after the age of 20, with tendon and eyelid xanthomas, lipemia in the retina, and early-onset and rapidly developing atherosclerosis. Sclerosis can be accompanied by pancreatitis and diabetes. This type is very common.

(4) Type V (mixed hyperlipoproteinemia). It is often accompanied by obesity, diabetes, episodes of acute abdominal pain (acute pancreatitis), hepatosplenomegaly, rapidly progressing atherosclerosis, lipemic retina, and may be accompanied by rash-like xanthomas. This type is rare.

Diagnostic criteria for hyperlipidemia:

(1) Hypercholesterolemia: serum total cholesterol (TC)>6.5 mmol/L;

(2) Hypertriglyceridemia: triglyceride (TC)>2.2 mmol/L;

(3) Low-density lipoprotein-cholesterol (LDL-C)>4.16 mmol/L Liter;

(4) High-density lipoprotein-cholesterol (HDL-C)>0.91 mmol/L.