跟读练习: What is Nuclear Medicine | Dr. Paulien Moyaert - 通过视频学习英语口语
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In this video, I'll explain what nuclear medicine is and what it's used for.
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Nuclear medicine is a medical specialty that uses small amounts of radioactive materials to diagnose and treat diseases.
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Unlike radiology, which relies on external sources of radiation,
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nuclear medicine involves introducing radioactive substances into the patient's body through swallowing, injection, or inhalation.
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These substances are then attracted to specific organs, bones, or tissues, and emit radiation, which is picked up by a special camera.
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Nuclear medicine, in a sense, is radiology done inside out.
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Nuclear medicine is unique because it images organ function rather than just the anatomy.
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Here's an example.
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In this CT scan, we're looking at a patient who has already been diagnosed with breast cancer.
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On the CT scan, doctors noticed three dark gray masses, but they weren't sure if these were cancer spreading.
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Therefore, the doctor scheduled a PET scan to get a clearer picture.
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The patient received a small amount of radioactive glucose.
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This glucose is attracted to almost all cells in our body, especially cancer cells, as they need a lot of oxygen to grow their tumor.
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On the PET scan, the first two spots didn't light up much, suggesting it's probably not cancer.
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The third spot, however, lit up significantly, indicating that it's likely the breast cancer has spread to the liver.
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Although nuclear medicine is primarily used for diagnosis, it can also be used to treat diseases,
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for example, for the treatment of prostate cancer or pain relief from certain types of bone cancers.
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Finally, while the term radioactive may be alarming, it's important to understand that nuclear medicine procedures are designed to be safe.
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For instance, a single bone scan typically yields about 4 mSv of radiation,
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whereas a full-body CT scan often results in at least double that amount.
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What most people don't know is
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that we are naturally exposed to a certain level of radiation due to naturally occurring radioactive minerals.
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The average American receives an annual radiation exposure from natural sources of about 3 mSv.
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Moreover, the higher the altitude, the higher the radiation dose, with air crew members experiencing roughly the same level of radiation exposure annually compared to
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that of a bone scan without ever undergoing a nuclear imaging procedure.
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In conclusion, nuclear medicine procedures are safe when put into perspective, and they play a crucial role in early disease detection.
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Thank you for watching this video.
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If you want to learn more about nuclear medicine, check out my playlist to watch the other videos on this topic.
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您正在使用跟读技巧通过视频"What is Nuclear Medicine | Dr. Paulien Moyaert"练习英语口语和发音。
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什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。