CT Collimators explained 📐 Pre-patient vs Post-patient collimation — know the difference In CT scan, collimators are used to shape and restrict the X-ray beam, helping to control dose and improve image quality. 🔹 Pre-patient collimator • Positioned before the patient • Restricts the primary X-ray beam • Determines slice thickness • Helps reduce unnecessary radiation exposure 🔹 Post-patient collimator • Positioned after the patient (before detectors) • Restricts scattered radiation • Improves

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Civil Engineer Surveyor on Instagram: "📘 Civil Engineering Leveling – MCQs (With Correct Answers) Leveling is one of the most important topics in Surveying (Civil Engineering). In this post, you’ll find basic to important MCQs on Leveling, including instruments, staff readings, benchmarks, line of collimation, and Height of Instrument method — all explained in a clear and exam-oriented format. ✅ Perfect for: • Civil Engineering students • Surveyors • Diploma & Degree exams • Interview preparati