1. When using high-resolution CT, compared with thin-slice CT, it is necessary to increase the voltage and current appropriately and use the traditional CT scanner.
2. When imaging, high-resolution CT will accurately determine some parameters, maximize the spatial resolution, have excellent spatial resolution, and can clearly display the fine structure of lung tissue, almost reaching the morphological changes similar to those of gross specimens, which is clearer than thin-layer CT imaging.
The thickness of CT slice refers to the thickness of scanning slice.
CT slice spacing refers to the distance between the centers of two scanned slices.
Extended data:
High resolution CT application:?
1. Patients have obvious respiratory symptoms, but chest X-ray and routine CT are normal, including unexplained acute or chronic dyspnea and hemoptysis, especially patients with abnormal pulmonary function examination. ?
2. Diagnosis and differential diagnosis of diffuse diseases, especially carcinomatous lymphangitis, idiopathic interstitial fibrosis, emphysema and bronchiectasis. For example, the probability of lymphangitis caused by breast cancer metastasis is more common, while chest radiographs and conventional CT are often normal. At this time, HRCT examination is very necessary. When typical HRCT manifestations appear, HRCT can almost replace further pathological examination to make a definite diagnosis.
3. Assessing the activity of diffuse lung lesions is helpful to the selection of biopsy sites and the observation of curative effect after treatment. ?
4. Small nodule lesions can better display the morphological characteristics of masses and nodules, such as finding calcification, fat composition, edge shape estimation, etc., which is helpful for the diagnosis and differential diagnosis of early lung cancer.
References:
Baidu encyclopedia -—HRCT