229 Come and study for my graduate school

Su Yang originally wanted to stand in the aisle and wait quietly, but Tao Yu waved: "Xiao Su, come up here to sit." He pointed to the seat where the leaders in the first row were sitting. Su Yang wanted to refuse, and Tao Yu said: "Let's hurry up and communicate quickly, okay."

In the first row, a leader-like man stood up and waved to Su Yang, signaling him to come to him and sit next to him. Su Yang had no choice but to take two steps at the same time and sit in the first row!

The question exchange process continues.

"Professor Tao, I want to ask you a question: Are there any contraindications for CT in the diagnosis of hip-related diseases?"

Tao Yu did not answer immediately, but looked at the student quietly. He kept looking at him for five seconds, which made the student feel a little scared.

After that, Tao Yu said calmly: "If I remember correctly, when I was talking about the question you asked just now, you just turned around and chatted with the female student behind you, right?"

“…”

The student blushed and couldn't say a word.

Others burst into laughter.

However, Tao Yu still gave a brief introduction.

"Next." Tao Yu said quickly.

However, no one dared to stand up and ask questions immediately, because Professor Tao Yu had expressed his wish just now, and not to ask a question he had already mentioned, so those who had been absent during the lecture did not dare to stand up.

After more than ten seconds, a male student stood up and said, "Professor Tao, I have a question to ask you. Is the smooth morphological method you mentioned just now the first thing to study abroad? Can you give us a detailed introduction?"

After hearing this, Tao Yu was silent again.

What's wrong with these students?

Isn’t this the basic knowledge in the textbook?

How could I think this is the first research abroad?

He was both sorry that he was helpless and had no choice but to say patiently: "For your question, I suggest you go back and read your textbooks, page 327, there is a detailed introduction there, okay?"

“…”

The student lowered his head in shame again.

He originally wanted to perform well in front of a girl he liked, but he didn't know...

Given that the two students in front of them had hit a nail, no students dared to stand up and ask questions again.

"Next!" Tao Yu said.

But no one stood up.

"Next? Are there any students who want to ask questions?" The host also looked around and asked.

But no one really stood up again.

Tao Yu became increasingly disappointed.

When his eyes saw Su Yang sitting quietly, he felt more and more relieved. No matter what, a student asked a question that he thought was quite interesting tonight.

"Is there any more? If everyone doesn't happen, it will be dispersed!" Tao Yu couldn't wait to say authentically.

No one stood up.

"Then let's get here today!" Tao Yu said simply. After saying that, he waved to Su Yang, and the smile on his face could not be hidden.

Su Yang quickly stood up.

"Let's continue the topic just now." Tao Yu looked at Su Yang.

"Okay, thank you Professor Tao."

"I have done related research before and found a new CT image segmentation method for lungs containing pleural nodules.

This method mainly includes four steps: image preprocessing, chest extraction, lung identification and lung margin repair.

In the image preprocessing stage, in order to reduce the influence of noise on the segmentation algorithm, the anisotropic diffusion filtering method is first used to smooth the image; since the human lungs are very large, a complete scan of the entire lung usually contains hundreds of ct slices, and segmenting these data requires huge calculations. Therefore, in order to reduce the calculations, in the chest extraction stage, I used the threshold method to roughly extract the chest area, and only the chest area data was processed in the subsequent process;

Next, in the lung discrimination stage, I first used the fuzzy c-mean method to divide the gas-filled area, and then used the regional growth method to remove the large trachea. Since the pleural nodules and surrounding tissues have similar grayscale, the above-mentioned segmentation results are difficult to accurately include them. Moreover, the lung blood vessels are also excluded, resulting in unevenness near the hilar area. Therefore, in the final lung edge repair stage, I used the iterative adaptive average algorithm and the adaptive curvature threshold method to include the lost pleural nodules again.

The experimental results show that my method can not only effectively contain pleural nodules, but also smoothly contain blood vessels in the hilar area."

Tao Yu introduced in detail, explained one by one, organized and easy to understand. Su Yang nodded repeatedly after a few words.

Su Yang's current imaging level has reached the entry-level level, and his ability to watch movies is actually not bad. As long as it is not too special or too complicated, he can basically tell a 34,56, but he can't understand some complex cases or some special films.

Because at this time he only knew the truth but not the reason. In other words, he only knew that the film with this disease should look like this, but he didn't know why the film looked like this, why the film was like this at this time, how did it come about, whether there were some things in the middle that had been processed, and so on, he didn't know these things.

But at this moment, what Professor Tao Yu taught him was to teach him why. Professor Tao Yu told him how this film came about, why it happened, whether some things would be processed in the middle, etc.

Simply put, Su Yang used to only watch movies that others had handled, but now Professor Tao Yu tells him how to deal with movies.

Most doctors actually only know how to watch movies. They don’t know how to deal with them to get a CT movie, but obviously, knowing how to deal with them and studying how to look at them will be a huge progress and leap. Just like those who practice, as long as you understand this problem, you can make a breakthrough!

Tao Yu just talked endlessly at first, and after talking for a while, he reached the key point, and suddenly felt that it was not enough to just talk with his mouth. So he turned around, picked up the whiteboard pen and wrote it on the whiteboard.

"The classic fuzzy c-mean clustering algorithm, the well-known fuzzy isodata, uses fuzzy membership values ​​to determine the similarity of vectors relative to each category. The fcm algorithm was proposed as an improvement of the early hard c-mean clustering method, where the hard c-mean clustering algorithm refers to directly and uniquely dividing each pixel into a certain category."

"fcm divides n vectors Ixin into c classes. By obtaining the optimal clustering center value and fuzzy membership value, the objective function reaches the minimum. The main difference between fcm and hcm is that fcm uses fuzzy membership values ​​to achieve segmentation, where the membership values ​​of each class are between. However, the sum of the memberships of any vector for all classes is always equal to 1, that is..."

Tao Yu wrote while talking.

Su Yang listened with relish and nodded from time to time.

Tao Yu asked: "Do you understand?"

Su Yang either replied "I understand" or said he was a little confused, so Tao Yu continued to talk.

There was a silence in the auditorium.

No one left, and all the students watched in a daze, and were stunned.

Everyone was just curious about how a trainee like Su Yang asked such a strange question? Can he understand?

Of course, everyone also wants to hear what Tao Yu said.

So everyone stayed.

The microphone was on the podium. At first, Tao Yu forgot to turn it off. Later, the host found that everyone was in high spirits, so he deliberately released the conversation between Tao Yu and Su Yang, so everyone heard it.

Everyone listened with relish at first, but as they listened, the situation suddenly changed because everyone couldn't understand!

Oh shit!

Isn’t this a medical class? Why are you doing the advanced mathematics?

Everyone was stunned. Looking at the large series of calculations written by Tao Yu on the whiteboard, they were stunned.

Many people even saw aliens: "Fuck! No? There is such a thing in medicine?"

Some knowledge of biochemistry is used in medicine, which is easy to understand, but high-quality...

No one knows what to say.

Tao Yu told the story in a silly manner, and the more he talked, the more he became more and more interested he became.

call--

He let out a long sigh, then unscrewed a mineral water bottle and drank a few big sips before asking Su Yang: "Do you understand?"

"I understand." Su Yang nodded.

"Then tell me!" Tao Yu asked.

"We repeat steps and steps here until the algorithm converges. When all fuzzy group clustering center values ​​are smaller than a preset threshold during two iterations, the value is 0.001 and the iteration process ends."
Chapter completed!