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Chapter 219 ¡¾219¡¿A test question suddenly came

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    Xie Wanying is really "stupid" and always stands in it.

    The teacher ran away, busy with something, and asked the students to study by themselves.

    She stood at the door of the control room, watching the two radiologists operating the instruments.

    This is the magnetic resonance room. It takes the longest time to take an MRI film, which is longer than CT and X-ray.  A cervical spine MRI scan sometimes takes an hour.  Not only are the patients tired, but so are the doctors.

    While waiting for the instrument to work on its own, a female radiologist in her thirties went to get a thermos cup to fill with water. When she saw her standing there alone, she was also curious: "Why don't you go outside for some fresh air?"

    "It's okay, teacher, I can stand still." Xie Wanying said.

    As a student who was different from others, the female teacher told her: "You can move a chair and sit on it."

    The teacher was very nice. Xie Wanying moved a chair to sit on and continued to watch the instrument rotate.  Before her rebirth, she also practiced as an intern in the radiology department and found it very interesting.  Now, she looked at the graphics on the computer monitor and wanted her brain to spin with the machine.

    "Have you read the film?" the female teacher asked her.

    "Try to read it." Xie Wanying said.

    "Here is a picture for you. Tell me which part of it was taken." The female teacher casually took a picture next to her and showed it to her.

    Xie Wanying took the film and only glanced at it. It was obviously: "Cranium."

    Several undergraduates outside the door noticed the teacher talking and immediately walked in to join in the fun. Seeing the film in her hand, they said in unison: "This is clearly the brain behind the photo."

    Teacher, this question is very easy.

    "What else?" The female teacher smiled again, with an unpredictable expression on her face.

    Several undergraduates wondered what the teacher meant.

    Xie Wanying answered directly: "This is a CT scan, not an MRI scan."

    The teacher was stunned for a moment and looked at her with a different look.

    Several undergraduate students blinked: It¡¯s not MRI but CT?  This is an MRI examination room, not a CT examination room. Why did the teacher take CT films?

    "Can you tell the difference between a CT scan and an MRI?" the teacher asked again.

    X-rays are definitely different from CT and MRI films, and they are completely different at a glance.  However, CT scans and MRI scans are very similar at first glance. If they are not marked clearly, it would be difficult for a layman to tell the difference, let alone a layman who has not seriously studied diagnostic radiology.

    The teacher is asking you, which is equivalent to asking questions for all the trainees today.

    Almost all the classmates were dumbfounded.  It was their first day as a trainee in the radiology department. They had only had one or two classes in class, and the class teacher only had time to give an overview.

    Some students may have reviewed the subsequent homework in advance, but without endorsement, they were suddenly asked to answer specific questions about this kind of horizontal comparison. The students were confused because the book knowledge they had learned had not had time to connect with reality.

    Many students looked at each other.

    The teacher laughed when he saw it: "It seems that the teacher in class didn't tell you. None of you can answer it?"

    If the teachers collectively looked down upon them when they first came to the internship, it is estimated that the students in their two classes will become bad students in the future due to the word-of-mouth communication from the clinical teachers.

    "Tell me about it." The teacher pointed at Xie Wanying, because she was the first person to say that this was not an MRI film.

    "Both MRI films and CT films are cross-sectional images, with contrasting colors ranging from black to white to show the structure of each tissue. But the imaging principles are different. CT films reflect the electron density and x-ray attenuation coefficient of the tissue, while nuclear magnetic films and  The distribution of hydrogen protons in tissues and organs is related. Adipose tissue is black on CT films but white on MRI films. Bone cortex is very white on CT films but very dark on MRI films. If the teacher brings another MRI film of the same part, it will be different from the CT film.  Put the two together and you can see the difference immediately." (Remember the website address: www.hlnovel.com
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