The goal of this clinical trial is to test intracranial blood flow and cerebral oxygenisation changes in patients who have pneumoperitoneum in laparoscopic cholecystectomy procedure. The main questions aim to answer are: * How does pneumoperitoneum in laparoscopic cholecystectomy procedure changes blod flow in patients? * Are there any differences between Near-Red spectroscopy and transcranial doppler ultrasonography assesment? Participants will be diagnosed with using NIRS probes and Doppler ultrasonography probes if any changes in surgical procedure. Researchers will compare NIRS and TCD detection outcomes to see if there is any differences.
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Detecting Cerebral Blood Flow Changes at Pneumoperitoneum Time via New Assessment Methods
Timeframe: Perioperative Time in Laparoscopic Cholecystectomy Surgery Procedures
Detecting Cerebral Tissue Oxygenisation Changes at Pneumoperitoneum Time via New Assessment Methods
Timeframe: Perioperative Time in Laparoscopic Cholecystectomy Surgery Procedures