Chapter 162 Doing experiments is like spending money
Gretel calmed down and recalled the principle of B-ultrasound first. - To be honest, B-ultrasound examination was a matter of the imaging department. In his previous life, he was an emergency doctor. He only needed to remember which symptoms should be sent for B-ultrasound and what to suspect.
It just depends on what kind of inspection the situation warrants.
As for the test results?
It's all written on the inspection sheet, and he doesn't even have to identify the images on the sheet himself. It's best if he can see it, but if he can't, the problem isn't too big...
As for what is the principle of B-ultrasound?
"Medical Imaging" has been taught, memorized, and tested - and forgotten. If it weren't for the memory enhancement that came with the time travel process, he might not even be able to recall what the book was about.
Hmm... Gretel slowly flipped through the pages of "Medical Imaging" in his mind. Fortunately, it was in the first chapter.
B-ultrasound uses 1 to 10 MHz ultrasonic waves to propagate in human tissues. When passing through different organs and different tissues, including multi-layer interfaces between normal and diseased tissues, each interface occurs due to the different acoustic impedance of the media on both sides.
Different degrees of reflection and/or scattering.
The echoes formed by these reflections or scatterings, as well as the attenuation information of the different tissues that the ultrasound passes through during propagation, are received, amplified and processed, and then displayed as images or waveforms on the screen to form an acoustic image.
Grete recalled the echo magic. "Displaying it as an image or waveform on the screen." This step is directly completed by the magician's meditation environment: it is equivalent to the magician temporarily growing a pair of bat "eyes", which can directly "
See” the shape traced by the echo.
Thank God, meditation can master the process of "seeing". Otherwise, in this environment where technological development is similar to that of the Middle Ages, he really doesn't know where to get a display screen, let alone a computer...
Then the next step is to "send ultrasonic waves" - by the way, you also have to find a coupling agent.
In the past, when doing B-ultrasound examination, coupling agent was applied to the patient's skin, and then the ultrasound probe was pressed against the skin. Without this thing to expel the air around the ultrasound probe, medical high-frequency ultrasound would not be transmitted at all.
Enter human tissue...
"Bernard! Come and shave the rabbit!"
Gretel shouted loudly. The barbarian came flying towards him. Gretel threw the work to him and turned around to find a replacement for the coupling agent.
Water...nope. It's not thick enough and it drains right away.
Alcohol... no. It has a consistency similar to water and is irritating to the skin.
Aloe vera gel... It's sticky, fluid, and seems to work. The problem is that it's winter, and there's nowhere to find aloe vera gel?
What about... glycerin?
Grete looked around his laboratory and cried. It had been such a long time since he traveled to the present, and he had finished busying with this and that, but he still hadn't had time to make glycerin.
We have to make this quickly! Grete silently added to his experimental plan and continued to search. Glycerin is out of stock. Where is soybean oil? Where is olive oil? Where is rose oil?... By the way, it's in my box.
Why is there rose oil?
"Gretel! The rabbit hair is shaved!"
Bernard called him from the other side of the room. Grete picked up two bottles of cooking oil in one hand and several bottles of sesame oil with an unknown smell in the other hand and rushed over:
"...Why did you shave it all over?"
Obviously just shaving the belly is enough... Stop saying a word, this rabbit is so ugly after being shaved...
But it was too late to complain now. Grete uncorked the bottle and poured a puddle of soybean oil - the cheapest one - onto the rabbit's belly. He pressed his fingers on the rabbit's belly. He grabbed the bat through his glove with his other hand.
Take a deep breath, take a deep breath, calm down, activate your magic——
The ultrasonic wave is controlled to be emitted from the fingertips of the right hand. Through the conduction of the coupling agent, it enters the rabbit's body.
emmmm……
Can't see clearly.
More intensity?
I still can’t see clearly. The picture fed back by the ultrasonic wave is very blurry. Not only that, the picture also includes the cage under the rabbit, the wooden cabinet under the cage, and the ground under the cabinet...
Is it related to the coupling agent? Grete grabbed a rag, wiped off the soybean oil, washed it, and then poured olive oil. The clear and bright liquid flowed on the rabbit's abdomen, which made Grete's eyebrows twitch, and there were bursts of pain in the precardium.
, as if being pinched hard by an invisible hand.
Grete knew that this was not angina pectoris caused by myocardial ischemia, he was just distressed, distressed...
Money!
This is all money!
Olive oil is so precious! You can’t buy such a small bottle with a single gold coin!
Hey, the effect of using olive oil as a coupling agent seems to be better than that of soybean oil, and the ultrasonic feedback is less noisy. I seem to have heard somewhere that some liquids do not have high sound conductivity, and also contain other impurities that hinder the conduction of sound waves, and
It cannot be used as a coupling agent. Sure enough, it is right to test a few more...
However, the clarity of olive oil was still too far from Grete's requirements. Grete endured her heartache and tried sweet almond oil, apricot kernel oil, rose oil...
2 gold coins a bottle!
5 gold coins a bottle!
12 gold coins a bottle!
Jingle bell, jingle bell, jingle bell...
What flows out of the bottle is not a substitute for coupling agent, it is all money!
Grete's face twisted and twisted again and again.
Fortunately, most of the oil was not bought by him: some were trophies obtained after completing the battle, some were applied to the Magic Council in the name of experimental materials, and some were conveniently placed here by magicians who came to help. After the experiment, others
Once he left, all the materials belonged to him.
If this was done now, Grete would go bankrupt immediately.
After a round of experiments, sweet almond oil was the most effective, but I could only vaguely "see" the bones of the rabbit. Grete sighed:
He has no way to improve the technical path of couplant, otherwise... make the ultrasonic wave bigger?
Adjusted spell model!
Increase output power!
Oops, the rabbit is vomiting blood...
Gretel was at a loss. He stopped releasing magic and asked Bernard to let go of his hands. The grass rabbit was lying under the cage, kicking its four legs, trying to get up, but he had no strength. There was a stream of steam coming from his mouth.
Covered with blood, Grete looked at it for a while. The rabbit tilted its head to the side and lost its breath.
died?
The ultrasonic power was too high and it killed the rabbit?
Blood coming out of the mouth is mostly caused by massive bleeding from the upper gastrointestinal tract... Wait, is it caused by the B-ultrasound?
If nothing is decided, let’s do an autopsy. Grete carried the dead rabbit to the operating table, geared up, and started to operate. Bernard followed closely, handing him the knife and scissors, and watched Grete click.
The ground was shearing fur and bones, and he suddenly asked:
"So we're having...roasted rabbit tonight?"
Gretel: "..."
so?
What so?
So I did the B-ultrasound experiment to get rabbit food for you?
When I find out the cause of death, I will think about whether to eat or not!