Chapter 742 Why Do You Want to Do Magic CT? Do You Need to Change the Algorithm? (Updated 10,000 Words and Reached 33)
Chapter 742: Let’s do magic CT... What, do we need to change the algorithm? (Updated 10,000 words and reached 33)
When it comes to performing CT scans on people, Grete once did it while rushing to the shelves.
That was still on the Black Gate Peninsula, close to the Great Wasteland. The barbarian nicknamed Old Hunchback swallowed a spoon. In order to determine whether the handle of the spoon was inserted into a blood vessel, Gretel had no choice but to perform a very low-precision CT scan.
That time, everyone who heard it was in tears and everyone who saw it was sad. The old hunchback asked him to tie him to a chair and not allow him to move. He then put him on a floating saucer and slowly rotated it. Turn an angle, Grete manually records a batch of data, turn another angle, record another batch of data...
By the time the data recording was completed, it had been two hours of work. The poor old hunchback's bladder was about to explode, so Gretel had to manually treat it for him.
It is obviously impossible for a mouse to remain still for two hours in its natural state. Gretel pulled a chair, sat down next to the center of the mage tower, and looked at the mouse:
How to make it stop? Tied up? Should 2% sodium pentobarbital solution be used for intravenous injection? Or intraperitoneal injection of 10% chloral hydrate solution?
Don't think about it, there are no anesthetics, not any of them...
Grete tried first, tying the mouse with vines and hanging it in the air. Without even turning on [Detect Magic], the naked eye could see the mouse struggling and twisting desperately among the vines, its four little claws digging incessantly.
This is definitely not possible. If you don't stand still quietly, let alone CT, even plain X-rays won't be able to show it.
Hmm... How about confining the mice?
Grete threw a [Tranquility Spell] tentatively. Very good, the mouse did not move. Then, throw [Detection Magic]——
Perfect!
The shadow of the bones can be seen clearly under the light of X-ray, ah no, [Detection Magic]!
He asked the invisible servant to bring a shelf and hang the rat on the shelf with its tail facing up and its head facing down. Place it in the center of the floating saucer and issue the command:
"MOSS, ask the invisible servant to rotate this floating disk as slowly as possible! Well, one degree per second, one circle every six minutes, keep rotating evenly!"
"No problem, boss!"
Tarling answered flatly. Of course, MOSS's factory settings are like this. Although he has learned to tell jokes, talk back, and even hurt him, he has never learned to fluctuate in tone. Gretel didn't care and took out the golden treasure box:
"MOSS, connect this box to the center of the mage tower."
"Okay, boss."
"Save all the images I sensed. Well, how often can you save it? Can 0.1 seconds be enough? Is the image accuracy high enough that a target of 0.5 mm can be seen clearly?"
"No problem, boss."
Ta Ling's voice remained unwavering. Gretel took a deep breath, fixed the oak staff on the opposite side, and activated [Detection Magic]:
"Three, two, one, start!"
In the world of meditation, a picture similar to an X-ray film shone brightly, and then passed through the golden treasure box, flowing into the center of the mage tower, and was silently stored.
Grete sighed secretly. Once upon a time, when he just came to this world, he could only try to take a plain X-ray film; after so many years, he has accumulated enough resources, and he can already try to do a CT scan:
There was no golden treasure box to turn the meditation images into real images. He would be so tired that he would vomit blood if he only relied on hand painting;
Without the technology to connect the golden treasure box to the center of the mage tower, relying solely on chips, accumulating resources will make him bankrupt;
There is no mage tower to store data, and there is no tower spirit to calculate. If he relies on himself to calculate, he will definitely calculate until death...
And now, one circle is over, another circle. After three rounds in a row, enough data had been accumulated. The mouse was released from the spell and placed in a corner. It was given a soothing spell to let it eat and drink on its own. Grete held the notebook and sat next to the center of the mage tower:
"MOSS, call up the image, just one."
A plain radiograph of the mouse was projected on the wall. Grete pointed to the anteroposterior plain film and explained to MOSS:
"MOSS, from white to black, how many brightnesses can you discern in total? Can they be divided equally?"
"Boss, how do you divide it equally?"
It's over. Grete slapped his head, making a crisp sound. Although MOSS can chat with him and help him handle affairs, its essence is artificial intelligence!
The characteristic of artificial intelligence is that if you don’t know it, you won’t. Even if the artificial intelligence can learn by itself, you have to teach it first...
So, how should this brightness be defined?
He went from high school physics review to college physics review to "Medical Physics". Coupled with some messy fragments of knowledge, he finally deduced a method:
"MOSS, you find a non-luminous wall - preferably a white wall. In the dark, define the brightness as 0, then use the brightest white light you can to illuminate it, and define its brightness as 255 .”
The display screen in the center of the mage tower flashed, then flashed again, emitting a white light, and then completely went out. Then, a line of words was printed in the white light: 255. It went out again, and a line of words was printed on the black screen: 0.
Okay...that's okay too. Grete continued to give orders:
"You reduce the brightness of the brightest white light by half...or half the energy, and illuminate the wall. Then, the color obtained is half of the brightness. Divide the two equally, and so on. Is this okay?"
The display flashed rapidly. Grete almost thought he heard the "crunching" sound of the hard drive. Soon, a square flashed across the screen:
16 rows, 16...probably 16 columns. Grete looked at it for a long time, but could not see how many vertical grids were divided into each horizontal row...
He belatedly remembered a sad fact: the human eye has its limits. There are only 16 levels of gray that humans can distinguish...
"MOSS, can you distinguish these brightnesses?"
"Okay, boss."
"Can you discern these different brightnesses in the images you recorded?"
"Okay, boss."
Thank God... Gretel breathed a sigh of relief. After all, the information received through the meditative vision is different from the human eyes. Although the eyes could not distinguish it, the information was faithfully translated through the golden treasure box and recorded by the center of the Mage Tower.
If you can distinguish it, you can make CT images with high accuracy!
Grete continued to give orders:
"Okay, MOSS, cut the image you recorded into small grids of 0.5 mm by 0.5 mm, and then label the brightness of each small grid with numbers."
This time, the tower spirit remained silent for longer, so long that Gretel almost thought that the tower spirit was broken...or stuck. Alas, it would be nice to have some sound, such as the hum of the hard drive, or the rotation of the fan...
Thinking too much, this is the center of the mage tower, there are no such sounds. It's not impossible to let MOSS simulate it, but when it's working hard, do you have to give yourself some sound effects to tell yourself that it's working hard?
It drags down the computing power, so why bother.
Grete poured herself a cup of tea and sipped it slowly. Drinking tea and eating biscuits, it wasn’t until two cups of tea were finished and a plate of biscuits was empty that MOSS’s voice was heard:
"Boss, that's it."
"...Very good. Then, MOSS, you take this picture..."
He waved gently. In the void, [Silent Phantom] pulled out a cube, and the cross-section inside was divided into countless square boxes. Then, the upright image, with the center of the cross section as the axis, is stretched 360 degrees:
"The data of each point in each picture is labeled. Calculate the sum of the data of each point, find the average, and restore it into an image according to the corresponding light and dark. Finally, stack them one by one to make a three-dimensional image .Is that okay?”
"Okay, boss. It takes time, boss."
"Okay, I'll leave it to you."
MOSS silently began to calculate. Grete rolled up his sleeves and began to do his part:
Dissect the mouse.
Well, according to the fixed operating procedures, grab the tail with your right hand and lift it up; press the head and neck of the mouse with the thumb and index finger of your left hand, and press down; grab the base of the tail with your right hand, and wrap the tail around your fingers in a circle, one, two, three , pull hard!
Bang!
Beautiful, and executed neatly. I haven’t given up on my previous experiments with mice!
Gretel gave himself a thumbs up and began to dissect. Following the previous surgical approach, incise the skin, cut through the muscle tissue, and expose the ribs. Remove wires from ribs, remove wires from spinous processes…
Pick up the mouse and use [Detection Magic] to take a picture of it from the front and side. There is no obvious change in the scoliosis angle, indicating that the scoliosis is structural and has been completely developed. Okay, take out the spine and start looking at the pathological changes!
Gretel "clicked", "clicked", and stabbed at the cervical vertebra and between the lumbar vertebra and coccyx. Then cut the ribs and take out the spine.
When you pick it up, you can see that the spine is centered on the top vertebra, with the vertebral body bending sideways on the coronal plane, lordosis on the sagittal plane, and rotating on the longitudinal axis. It is obvious that a three-dimensional S shape has been turned out.
"MOSS! Record the shape of this spine!"
It's broken, MOSS doesn't respond, MOSS is stuck... Is there too much that needs to be calculated, and I still haven't figured it out yet?
Grete reached out and gently touched the vertebrae, trying to keep these deformations firmly in mind. This is what you're dealing with, this is what you're going to be treating in the future.
See clearly its condition and all its changes, and don’t let down the sacrifices of these experimental animals!
Gretel picked up the scalpel again and continued to dissect in detail. After removing the muscles next to the spine, you can see at a glance that the epiphyseal plate on the concave side of the vertebral body becomes thinner, and the cortex and trabeculae become thicker. As for the protruding side, corresponding to the thinning and thinning, there have been obvious organic changes.
Um……
If it is on the human body, how should it be corrected?
[Mage Trick]!
Gretel pinched out an object with the same shape and rough material, then trimmed it bit by bit and added bit by bit. Cutting, mending, cutting, mending, fragments were flying in front of me, and the S-shaped twisted spine became erect little by little.
"Okay... now we have to see how this kind of repair can prevent damage to the spinal cord and nerves..."
And if you want not to hurt these things, CT is the most basic. In theory, NMR should be developed, but NMR...
He still doesn't know what to do...
Grete straightened up and stretched hard. But it was done, but if he couldn't do it anymore, he felt like he was going to have a herniated disc:
"MOSS, are you okay?"
"It's almost...alright..." MOSS's voice got stuck one after another, as if he was still making difficult calculations:
"Boss... give... me... some... time..."
This speed is not good! An hour has passed since I finished this wave of research, but the 3D reconstruction report hasn’t come out yet!
In my previous life, a chest scan would result in a report in the emergency room within 15 minutes. The size of the chest of mice is much smaller than that of humans, and it still hasn’t come out yet?
Grete finished cleaning up the mess, drank a glass of milk, and ate two cookies as a midnight snack. Looking back, MOSS finally projected a three-dimensional image in front of him. Gretel only glanced at it and frowned tightly:
Tsk, this still doesn’t work!
It's so blurry that the edges of organs and bones can't be seen clearly at all!
The speed is slow and the images are blurry. For this magic CT, the algorithm must be iterated!
Definitely need to iterate!
Alas, he really can't write algorithms... I'll go to Mrs. Alva's tomorrow and ask if there is any magician who is good at training artificial intelligence?
****
3400 words!
Ten thousand words completed!
Will continue to update 10,000 words tomorrow!
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Thanks to x-on:book friend 20201027193620425131037 for his lectures...
It must be said that the boss is the boss. I studied the relevant knowledge of CT, including grayscale and so on. I was still dizzy after studying it for a long time. The boss explained it clearly in a few words...