The goal of this clinical trial is to compare the effectiveness and safety of CT-guided versus fluoroscopy-guided trigeminal ganglion radiofrequency thermocoagulation (TG-RFT) in treating idiopathic trigeminal neuralgia (TN) in adults aged 18 and older. The main questions it aims to answer are: * Does CT-guided TG-RFT provide better pain relief compared to fluoroscopy-guided TG-RFT? * What are the differences in medication consumption between the two methods? * What are the procedure-related adverse events for both methods? Investigators will compare CT-guided TG-RFT to fluoroscopy-guided TG-RFT to see if one method is superior in treating idiopathic TN. Participants will: * Undergo either CT-guided or fluoroscopy-guided TG-RFT procedure * Be monitored post-procedure and followed up at 1, 3, and 6 months for pain relief, medication consumption, and adverse events.