Effect of Anode Voltage and Filament Temperature | X-Ray Tube Physics | BMRIT Radiological Physics

Описание: Effect of Anode Voltage and Filament Temperature | X-Ray Tube Physics | BMRIT Radiological Physics

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In this lecture, we explain the Effect of Anode Voltage (kVp) and Filament Temperature (mA) in the X-ray tube — a very important topic in Radiological Physics for BMRIT students.

Understanding this concept is essential for:
BMRIT 2nd Semester exams
Radiography viva
X-ray production theory
Practical radiographic techniques

🔬 Topics Covered:

✔ Thermionic emission
✔ Role of tungsten filament
✔ Space charge effect
✔ Effect of filament temperature on tube current (mA)
✔ Effect of anode voltage on X-ray intensity
✔ Saturation current
✔ Relationship between kVp and X-ray quality
✔ Graph explanation

🧪 1️⃣ Effect of Filament Temperature

When filament temperature increases:

• More electrons are emitted (thermionic emission)
• Tube current (mA) increases
• Quantity of X-rays increases
• Image density increases

👉 Controls: mA

At very high temperature → saturation current occurs.

⚡ 2️⃣ Effect of Anode Voltage (kVp)

When anode voltage increases:

• Electron speed increases
• Kinetic energy increases
• X-ray penetration power increases
• X-ray intensity increases

👉 Controls: Quality (energy) of X-rays

Higher kVp → Higher penetrating power → Less contrast.

📊 Important Exam Points
Parameter Controls Affects
Filament Temperature mA Quantity of X-rays
Anode Voltage (kVp) kVp Quality & Energy of X-rays
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