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CT常識

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最后修訂:
2017年05月17日 05:45
CT維修維護 3518


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CT(X線電子計算機斷層掃描)是利用X線斷層掃描,電光子探測器接收,并把信號轉化為數字輸入電子計算機,再由計算機轉化為圖像,CT是一種無痛苦、無損傷、無危險、快速、方便,適合于任何年齡且準確性高的輔助檢查工具。CT于1970年在英國設計成功,1973年首次報告在臨床應用中對腦部疾病的診斷價值,自1976年綜合報告6500例癲癇患者的CT檢查結果以來,國內外已相繼開展此項檢查,大大提高了顱內病變(占位性病變、血管病變、腦發育畸形及腦萎縮等結構性腦損害)的診斷水平,對癲癇病灶的立體定位、判斷病變病理特征和病因 分析較為可靠。CT檢查包括CT平掃(即不注射造影劑的常規CT)和 CT增強掃描(即經靜脈注入造影劑進行掃描 的方法)。

 

由于CT的應用,癲癇的病因確診率大為提高,CT檢查不但能顯示出病變的部位、形態以及與周圍腦組織的關系,并以此做出定性分析,而且還能發現僅有密度上的改 變而無占位效應的病變。CT發現癲癇患者的主要改變有 腦萎縮、腦新生物、腦梗死、腦發育異常、腦積水、鈣化 和動靜脈畸形等。

 

1、CT的特點:CT是計算機體層攝影的簡稱,1969年設計成功,具有檢查方便、安全、無痛苦、無創傷的特點。CT片圖像清晰、分辯力高、解剖關系明確、病態顯影清楚。

 

2、作腦部CT檢查的目的:很多原因均可引發癲癇病,比如腦萎縮、腦發育不全或遲緩、腦腫瘤、腦血管畸形、腦梗塞、腦積水、腦畸形、腦軟化、腦鈣化灶、未明原因或性質的高密度改變、低密度改變等等。如腦內有上述病變,CT檢查即可發現,如CT片顯示正常,一般可排除上述病變的存在。

 

CT(電子計算機體層成像)是70年代初放射診斷的一項重大突破,CT不是X線攝影,而是用X線對人體掃描,取得信息,經電子計算機處理而獲得的重建圖像。它能使傳統的X線檢查難以顯示的器官及其病變顯示成像,且圖像逼真,解剖關系明確,從而擴大了人體的檢查范圍,大大提高了病變的早期檢出率和診斷準確率。這種檢查簡便、安全、無痛苦、無創傷、無危險,它促進了醫學影像診斷學的發展,發明者獲得了1979年的諾貝爾獎金。CT最初只用于頭部檢查,1974年又出現了全身CT。在短短10余年間,CT已遍及全球,從第一代發展到第五代。我國各大城市醫院所使用的CT多屬第三代。全身CT可以作頭、胸、腹、骨盆的橫斷掃描,也可作甲狀腺、脊柱、關節和軟組織及五官等小部位的區域掃描。CT最適于查明占位性病變如腫瘤、囊腫、增大的淋巴結、血腫、膿腫和肉芽腫的大小、形態、數目和侵犯范圍,它可以決定某些器官癌腫的分期和是否能進行手術切除。在某些情況下,CT還能區別病變的病理特性如實性、囊性、血管性、炎性、鈣性、脂肪等。

 

CT檢查有三種方法,一是平掃,為普通掃描,是常規檢查;二是增強掃描,從靜脈注入水溶性有機碘,再進行掃描,可以使某些病變顯示更清楚;三是造影掃描,先行器官或結構的造影,再行掃描,如向腦池內注入造影劑或空氣進行腦池造影,再掃描,可清楚顯示腦池及其中的小腫瘤。

 

在CT檢查前,病人的準備也很簡單,只要檢查前禁食即可。但腹部檢查之前不能做其它造影檢查,尤其不能用鋇劑行消化道造影,以免腸內殘留的造影劑形成偽影,影響CT圖像質量,從而導致誤診。在頭部掃描之前,應先照X線頭顱平片和斷層照片。肝、膽、胰檢查前,要先做各項化驗檢查,照腹部平片,膽道造影和超聲檢查。腎臟檢查前,應做腎盂造影和B超檢查。胸部檢查前,應照胸部平片和斷層照片。脊柱檢查前,要先行脊柱正側、斜位照片等。以便選擇最佳掃描方式和最合理的掃描范圍

 

CT(電子計算機體層成像)是70年代初放射診斷的一項重大突破,CT不是X線攝影,而是用X線對人體掃描,取得信息,經電子計算機處理而獲得的重建圖像。它能使傳統的X線檢查難以顯示的器官及其病變顯示成像,且圖像逼真,解剖關系明確,從而擴大了人體的檢查范圍,大大提高了病變的早期檢出率和診斷準確率。這種檢查簡便、安全、無痛苦、無創傷、無危險,它促進了醫學影像診斷學的發展,發明者獲得了1979年的諾貝爾獎金。CT最初只用于頭部檢查,1974年又出現了全身CT。在短短10余年間,CT已遍及全球,從第一代發展到第五代。我國各大城市醫院所使用的CT多屬第三代。全身CT可以作頭、胸、腹、骨盆的橫斷掃描,也可作甲狀腺、脊柱、關節和軟組織及五官等小部位的區域掃描。CT最適于查明占位性病變如腫瘤、囊腫、增大的淋巴結、血腫、膿腫和肉芽腫的大小、形態、數目和侵犯范圍,它可以決定某些器官癌腫的分期和是否能進行手術切除。在某些情況下,CT還能區別病變的病理特性如實性、囊性、血管性、炎性、鈣性、脂肪等。

 

CT檢查有三種方法,一是平掃,為普通掃描,是常規檢查;二是增強掃描,從靜脈注入水溶性有機碘,再進行掃描,可以使某些病變顯示更清楚;三是造影掃描,先行器官或結構的造影,再行掃描,如向腦池內注入造影劑或空氣進行腦池造影,再掃描,可清楚顯示腦池及其中的小腫瘤。

 

在CT檢查前,病人的準備也很簡單,只要檢查前禁食即可。但腹部檢查之前不能做其它造影檢查,尤其不能用鋇劑行消化道造影,以免腸內殘留的造影劑形成偽影,影響CT圖像質量,從而導致誤診。在頭部掃描之前,應先照X線頭顱平片和斷層照片。肝、膽、胰檢查前,要先做各項化驗檢查,照腹部平片,膽道造影和超聲檢查。腎臟檢查前,應做腎盂造影和B超檢查。胸部檢查前,應照胸部平片和斷層照片。脊柱檢查前,要先行脊柱正側、斜位照片等。以便選擇最佳掃描方式和最合理的掃描范圍。

 

 

 

 

 

 

 

 

 

 

 

 

 

Need MRI, CT maintenance, spare parts , contact +8613805690379 . More information , more services .
 
CT (X -line computer tomography ) is the use of X-ray tomography , electro-optical detector receives the child , and to the input signal into a digital computer , and then from the computer into an image , CT is a painless , non-invasive , non- dangerous , fast , convenient and suitable for any age and high accuracy secondary inspection tool. CT in 1970 in British design success , in 1973 first reported in clinical applications for the diagnosis of brain diseases , from 6,500 cases in 1976, consolidated report CT findings in patients with epilepsy since , at home and abroad have been carrying out this check , greatly increased intracranial lesions ( lesions, vascular lesions , brain malformations and brain atrophy and other structural brain damage ) diagnostic level , three-dimensional localization of epileptic foci , to determine the cause of disease pathology and more reliable . CT examination including CT scan ( ie, not the regular injection of contrast medium CT) and CT scan ( ie, intravenous injection of contrast agent for scanning method ) .
Since CT applications, the cause of epilepsy diagnosis rate greatly improved , CT examination showed lesions not only the location, shape , and the relationship with the surrounding brain tissue , and thus to make a qualitative analysis , but also found that only on the density change without mass effect of the lesion. CT findings in patients with epilepsy major changes with brain atrophy , brain neoplasm , cerebral infarction , cerebral abnormalities , hydrocephalus , calcification and arteriovenous malformations.

1, CT features : CT is short for computed tomography , 1969 successfully design , with checks convenient, safe , painless , non-invasive characteristics. CT slice image clarity, differentiate force, anatomical relationship clear , morbid developing clear.

2 , for the purpose of brain CT examination : Many things can trigger epilepsy, such as brain atrophy , cerebral hypoplasia or retardation, brain tumors, vascular malformations , cerebral infarction , hydrocephalus , brain malformations, softening of the brain , cerebral calcification stoves, unknown cause or nature of the change in high-density , low density change and so on. If the above brain lesions , CT examination can be found , such as CT films showed normal , generally exclude the presence of the lesion .
CT ( computer tomography ) is in the early 1970s a major breakthrough in diagnostic radiology , CT instead of X -ray photography , but with X-rays on the human body scanning , access to information , obtained by computer processing of the reconstructed image . It enables conventional X -ray examination of organs and lesions difficult to show display imaging, and image fidelity , clear anatomical relationship , thereby expanding the scope of the inspection body , greatly improving the detection rate of early lesions and diagnostic accuracy. This check is simple, safe , painless , non-invasive, non-hazardous , it promotes the development of medical diagnostic imaging , the inventors won the Nobel Prize in 1979 . Initially used only for head CT examination, appeared in 1974, the body CT. In just more than 10 years , CT has been all over the world , from the first generation to the fifth generation . China's major urban hospitals are mostly used by the third generation CT . Body CT can be used for head, chest , abdomen, pelvis, cross-sectional scans , but also for the thyroid , spine, joints and soft tissue and facial features and other small parts of the area scanned. CT is best suited to identify lesions such as tumors , cysts, enlarged lymph nodes , hematoma, abscess and granuloma size, shape , number and scope of violations , it can determine the stage of cancer and certain organs whether for surgical excision. In some cases , CT can accurately distinguish characteristics of pathological lesions , cystic , vascular, inflammatory , calcic , fat .

CT examination , there are three ways, first scan, as an ordinary scanning is routine examination ; Second, enhanced scan , from intravenous injection of soluble organic iodine, then scanned , you can make some of the lesions show more clearly ; Third, CAT scan , first organ or structure imaging, scanning again , such as the intracisternal injection of contrast agent or air cisternography , and then scan clearly shows that the small pool and its brain tumors.

Before the CT examination , the patient's preparation is also very simple , as long as you can before the examination fasting . But before the test can not do other abdominal angiography , especially not with gastrointestinal contrast barium line to avoid the formation of intestinal residual contrast agent artifacts affect CT image quality , resulting in misdiagnosis. Before scanning the head , according to X-ray the skull should be flat sheet and faults photos. Liver, gallbladder, pancreas before the inspection , the laboratory should first check , according to KUB , cholangiography and ultrasound. Kidneys before the examination , should be done pyelography and B-ultrasound. Chest examination , should shine chest radiograph and CT pictures. Spine before the examination , to advance the positive side of the spine , oblique photos. Choose the best way to scan the scanning range and the most reasonable

CT ( computer tomography ) is in the early 1970s a major breakthrough in diagnostic radiology , CT instead of X -ray photography , but with X-rays on the human body scanning , access to information , obtained by computer processing of the reconstructed image . It enables conventional X -ray examination of organs and lesions difficult to show display imaging, and image fidelity , clear anatomical relationship , thereby expanding the scope of the inspection body , greatly improving the detection rate of early lesions and diagnostic accuracy. This check is simple, safe , painless , non-invasive, non-hazardous , it promotes the development of medical diagnostic imaging , the inventors won the Nobel Prize in 1979 . Initially used only for head CT examination, appeared in 1974, the body CT. In just more than 10 years , CT has been all over the world , from the first generation to the fifth generation . China's major urban hospitals are mostly used by the third generation CT . Body CT can be used for head, chest , abdomen, pelvis, cross-sectional scans , but also for the thyroid , spine, joints and soft tissue and facial features and other small parts of the area scanned. CT is best suited to identify lesions such as tumors , cysts, enlarged lymph nodes , hematoma, abscess and granuloma size, shape , number and scope of violations , it can determine the stage of cancer and certain organs whether for surgical excision. In some cases , CT can accurately distinguish characteristics of pathological lesions , cystic , vascular, inflammatory , calcic , fat .

CT examination , there are three ways, first scan, as an ordinary scanning is routine examination ; Second, enhanced scan , from intravenous injection of soluble organic iodine, then scanned , you can make some of the lesions show more clearly ; Third, CAT scan , first organ or structure imaging, scanning again , such as the intracisternal injection of contrast agent or air cisternography , and then scan clearly shows that the small pool and its brain tumors.

Before the CT examination , the patient's preparation is also very simple , as long as you can before the examination fasting . But before the test can not do other abdominal angiography , especially not with gastrointestinal contrast barium line to avoid the formation of intestinal residual contrast agent artifacts affect CT image quality , resulting in misdiagnosis. Before scanning the head , according to X-ray the skull should be flat sheet and faults photos. Liver, gallbladder, pancreas before the inspection , the laboratory should first check , according to KUB , cholangiography and ultrasound. Kidneys before the examination , should be done pyelography and B-ultrasound. Chest examination , should shine chest radiograph and CT pictures. Spine before the examination , to advance the positive side of the spine , oblique photos. Choose the best way to scan the scanning range and the most reasonable .


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