Lacunar stroke, also known as small vessel stroke, is caused by a blockage of small blood vessels within the brain. This type of stroke is responsible for about a quarter of all ischemic strokes.
The pathophysiology of lacunar stroke involves the occlusion of small penetrating arteries within the brain, which can lead to infarction of the deep nuclei, basal ganglia, thalamus, and/or brainstem. This occlusion is typically caused by the buildup of cholesterol and other fatty deposits in the blood vessels, known as lipohyalinosis. This process can also lead to the formation of microatheromas, which can break off and travel to small blood vessels in the brain, causing an embolism.
In addition to lipohyalinosis and microatheroma formation, other risk factors for lacunar stroke include hypertension, diabetes, and heart disease. These factors can weaken the walls of small blood vessels and increase the risk of occlusion and stroke.
Once a lacunar stroke occurs, the damage to small blood vessels in the brain can lead to a loss of neural function, which can result in a range of neurological symptoms, including motor weakness, sensory loss, and speech difficulties. Treatment options for lacunar stroke include medication and lifestyle changes to manage risk factors, as well as rehabilitation to help recover lost function.
sinkboat.exe2023-02-10 12:27:12
胸部X光片通常是通過一種稱為胸部X光技術拍攝的。拍攝過程通常是這樣的:
準備:您需要穿著醫院提供的X光防護服,而且可能需要移去任何金屬製品。
定位:您需要站著或坐在X光機前。
曝光:X光技師將使用X光機在你身上曝光機部,通常是通過將你的胸部手持住X光機的平板。
拍攝:技師將按下快捷鍵,以拍攝X照片。這通常只需要幾秒鐘的時間。
完成:拍攝完成後,X光師將判斷所拍攝的X片是否清澈。如果需要,他們可能會再拍攝一次。
請注意,這是一個大致的概述,實際拍攝過程可能因醫院而異。
甲級貧戶2023-02-10 12:29:01
講得好過lecture
thx ching
慘濄番印度2023-02-10 12:38:33
Describe the process of CT image reconstruction
sinkboat.exe2023-02-10 12:40:21
Computed Tomography (CT) image reconstruction is a process in which raw data obtained from a CT scan is transformed into a 2D or 3D image of the internal structure of the body. The process typically involves the following steps:
1. Data Acquisition: During a CT scan, an X-ray source rotates around the body, emitting X-rays which pass through the body and are recorded by detectors on the opposite side. This results in a series of cross-sectional data (projections) of the body.
2. Sinogram Generation: The projections are combined to form a sinogram, which represents the distribution of X-rays through the body in a particular direction.
3. Image Reconstruction: The sinogram is processed by algorithms to create a 3D image of the body. The most commonly used algorithms are filtered back projection (FBP) and iterative reconstruction (IR). FBP is a fast but simple method that convolves the projections with a filter to generate an image. IR is a more sophisticated and computationally intensive method that uses mathematical models to iteratively estimate the image.
4. Post-processing: The reconstructed image may undergo additional processing, such as adjustment of contrast, removal of noise, and correction of artifacts to
5. Image Display: The final reconstructed image is then displayed on a computer monitor, allowing physicians to visualize the internal structures of the body and make a diagnosis.
It is important to note that the accuracy and quality of the reconstructed image depends on various factors, such as the quality of the data acquisition, the reconstruction algorithm used, and the presence of artifacts.
甲級貧戶2023-02-10 12:41:46
How long do you think it will take for AI to completely replace internists and surgeons respectively?
sinkboat.exe2023-02-10 12:43:26
It is difficult to predict the exact timeline for AI to completely replace internists and surgeons. However, it is safe to say that AI will play an increasingly important role in healthcare and may potentially augment the work of internists and surgeons in the future.
Currently, AI technology is already being used in healthcare for tasks such as diagnosis, imaging analysis, and disease prediction. However, the complete replacement of internists and surgeons by AI is a complex issue that depends on many factors, including the development of AI technology, the regulations and ethical considerations surrounding its use, and the willingness of healthcare systems and patients to adopt it.
Additionally, medicine is a complex field that requires a deep understanding of human biology, disease processes, and patient needs, which may still be difficult for AI to fully replicate. The role of the human touch in medicine, such as empathy and the ability to connect with patients on a personal level, is also important to consider.
Therefore, it is likely to be many years or even decades before AI can completely replace internists and surgeons. However, the integration of AI into the healthcare system will continue to evolve and change the way medicine is practiced in the future.
孔子個徒弟2023-02-10 12:47:13
點解香港用唔到你?
甲級貧戶2023-02-10 12:50:34
Analyze the following argument:
"If you lower the pay of doctors, most of them will quit. Therefore, they are only in it for the money."