Chapter 219: 【219】Suddenly, there was a quiz question Chapter 219: 【219】Suddenly, there was a quiz question Xie Wanying was really “silly,” always standing inside.
The teaching doctor ran off, busy with something, leaving the students to study on their own.
She stood at the entrance of the control room, watching two radiology doctors operate the equipment.
This was the MRI room, where taking an MRI image took the longest compared to a CT and X-ray. A cervical spine MRI sometimes required scanning for an hour. Not to mention how tiring it was for the patient, the doctors were also exhausted.
When the machine was working on its own, a female radiology doctor in her thirties went to get water from her thermos, and seeing her standing there alone, she became curious, “Won’t you go outside for some fresh air?”
“It’s okay, teacher, I can stand,” Xie Wanying said.
Unlike the other students, the female teacher told her, “Get yourself a chair to sit.”
The teacher was nice, so Xie Wanying moved a chair to sit and continued to watch the machine spin. Before her rebirth, she had also interned in radiology and found it fascinating. Now, she looked at the graphics on the computer monitor, wanting her brain to spin along with the machine.
“Have you read images before?” the female teacher asked her.
“I’ve tried reading them,” Xie Wanying said.
“Take a look at this image and tell me which part it shows,” the female teacher casually picked up an image from the side to show her.
Xie Wanying took the image and with only one glance, it was obviously a “cranial brain.”
A few undergraduate students outside noticed the teacher talking and immediately came in to join the fun, seeing the image in her hands and in unison said, “This is clearly an image of the brain.”
Such an easy question from the teacher.
“What else?” the female teacher asked again with a mysterious smile on her face.
The undergraduates pondered the meaning behind the teacher’s words.
Xie Wanying answered directly, “This is a CT image, not an MRI.”
The teacher paused, looking at her with a different kind of sparkle in her eyes.
The undergraduates blinked: It’s a CT not an MRI? This is an MRI room not a CT room, why does the teacher have a CT image?
“Can you tell the difference between a CT image and an MRI?” the teacher asked again.
X-ray images are definitely different from CT or MRI images, distinctively different at first glance. But CT and MRI images are very similar at first glance, and if not labeled, even laypeople who have not studied radiological diagnosis seriously can’t tell them apart.
The teacher was asking you all, as if she was posing a question for today’s entire group of interns.
Nearly all the students were stumped. It was their first day of internship in radiology, and they had only attended one or two lectures in class, where the teacher had only had time to provide an overview.
Perhaps some students might have reviewed the upcoming lessons in advance, but without rote learning, when suddenly asked to answer such a concrete comparison question, the students were bewildered because the book knowledge they had learned had not yet been linked to practical experience.
Many students looked at each other in dismay.
Seeing this, the teacher laughed again, “It seems the classroom teachers haven’t discussed this with you. Can none of you answer?”
If they were collectively underestimated by the teacher on their first internship, it was likely that students from both classes would be passed off as mediocre in the clinical teachers’ word of mouth.
“You tell me,” the teacher directed at Xie Wanying, since she was the first to say this was not an MRI image.
“MRI and CT images are both cross-sectional images, using different shades of black and white to display the structure of various tissues. But the imaging principles are different. CT images reflect tissue electron density, X-ray attenuation coefficients; MRI images are related to the distribution of hydrogen protons in tissue and organs. Fat tissue appears black on CT images and white on MRI. Cortical bone appears very white on CT images and very black on MRI. Teacher, if you bring over an MRI of the same region, and place it alongside the CT image, the differences would be immediately noticeable.”