Xie Wanying was really "stupid" as she stood there the whole time.
The teacher ran away, busy with something, and let the students study on their own.
She stood at the door of the control room, watching two radiologists operating the equipment.
This is the MRI room. It takes the longest time to take an MRI, longer than CT and X-ray. Sometimes it takes an hour to scan a cervical spine MRI. Not to mention the patients are tired, the doctors are also tired.
While the instrument was working, a female radiology doctor in her thirties went to get a thermos cup of water. Seeing her standing there alone, she was curious and asked, "Why don't you go outside and get some fresh air?"
"It's okay, teacher. I can stand now." Xie Wanying said.
The female teacher told the student who was different from the others: "Move a chair and sit on it yourself."
The teacher was very nice. Xie Wanying moved a chair and sat down, continuing to watch the machine spinning. She had interned in the radiology department before her rebirth and found it very interesting. Now, she looked at the graphics on the computer monitor, wanting to let her brain spin with the machine.
"Have you read the film?" the female teacher asked her.
...
...
"I've tried reading it." Xie Wanying said.
"I'll give you a film. Tell me which part it is photographed in." The female teacher picked up a film next to her and showed it to her.
Xie Wanying took the film and took a quick look at it. It was obvious that it was: "brain."
Several undergraduate students outside the door noticed the teacher talking and immediately walked in to join in the fun. When they saw the film in her hand, they said in unison: "It looks like this is a picture of the brain."
Teacher, this question is easy.
"What else?" The female teacher smiled again, with an unfathomable expression on her face.
Several undergraduates pondered what the teacher meant by this.
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 in his eyes.
Several undergraduates blinked: "It's not MRI, it's CT? This is an MRI examination room, not a CT examination room, why is the teacher holding a CT film?"
"Can you tell the difference between CT scans and MRI scans?" the teacher asked again.
X-rays are definitely different from CT scans and MRI scans, and you can tell they are completely different at a glance. However, CT scans and MRI scans are very similar at first glance, and if they are not marked, even laymen who have not studied radiology diagnostics seriously would not be able to tell them apart.
The teacher is asking you questions, which is equivalent to giving a test to all the interns today.
Almost all the students were dumbfounded. It was their first day as an intern in the radiology department, and they had only attended one or two classes in the classroom, where the teacher only had time to give an overview.
Some students may review the later lessons in advance, but if they are not memorizing the lessons, and are suddenly asked to answer specific questions about horizontal comparison, they will be confused because they have not had time to connect the book knowledge with reality.
Many students looked at each other in bewilderment.
The teacher smiled again and said, "It seems that the teacher in class didn't tell you. Can't any of you answer it?"
If they were collectively looked down upon by the teachers during their first internship, the students in their two classes would probably become not-so-good students through word of mouth among the clinical teachers.
"Tell me what you think." The teacher pointed at Xie Wanying because she was the first person to say that this was not an MRI film.
"Both MRI and CT scans are cross-sectional images, which use contrasting colors from black to white to show the structure of each tissue. However, the imaging principles are different. CT scans reflect the electron density and X-ray attenuation coefficient of tissues, while MRI scans are related to the distribution of hydrogen protons in tissues and organs. Fat tissue is black on CT scans and white on MRI scans. Bone cortex is very white on CT scans and very black on MRI scans. If the teacher takes another MRI scan of the same part and puts it next to the CT scan, the difference can be seen immediately."
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