Official ARRT Registry Study Guide 2026–2027 –
Comprehensive Exam Review, Practice Questions &
Answers
Cathode - correct answers -1. Creates FREE electrons through thermionic emission
2. Negatively Charged
3. The cathode is the source of negatively charged electrons
Anode - correct answers -1. Absorbs electrons and creates xrays
2. Positively Charged
3. The anode attracts the negatively charged electrons from the cathode
Glass Envelope - correct answers -1. Creates an air-free vacuum around the cathode and anode
2. Protect X-ray tube oxidation
3. Without the glass envelope the filament would quickly burn up (X-ray production would NO LONGER
be possible)
4. Often made of borosilicate glass, metal, or ceramic
Tube Housing (Metal or Lead Housing) - correct answers -1. Prevents X-rays from being emitted
throughout the exam room
2. Must keep leakage radiation to maximum (0.88 mGy/hr)
Cathode - correct answers -Tungsten Filament
1
, Space Charge - correct answers -Cloud of FREE electrons
Space Charge Effect - correct answers -At 1000 mA, no more electrons can be forced out of the filament
Two Cathode Filaments (Dual Focus) - correct answers -Small Filament is 1 cm & Large Filament is 2 cm
Small Filament can on tolerate what - correct answers -Small mA, Small parts, Small exposures
Large Filament can on tolerate what - correct answers -Large mA, Large parts, Large exposures
Narrow beam results in - correct answers -High Spatial Resolution
Wide beam results in - correct answers -Low Spatial Resolution
Focusing Cup - correct answers -1. To focus the electron beam
2. Electrons & focusing cup negatively charged
Two types of Anodes are - correct answers -rotating and stationary
Stationary Anode - correct answers -1. Electron beam is focus onto one small area on the anode
2. All of the heat is focus onto one small area on the anode
3. Simple Design, Low heat capacity, Low exposures
2
Comprehensive Exam Review, Practice Questions &
Answers
Cathode - correct answers -1. Creates FREE electrons through thermionic emission
2. Negatively Charged
3. The cathode is the source of negatively charged electrons
Anode - correct answers -1. Absorbs electrons and creates xrays
2. Positively Charged
3. The anode attracts the negatively charged electrons from the cathode
Glass Envelope - correct answers -1. Creates an air-free vacuum around the cathode and anode
2. Protect X-ray tube oxidation
3. Without the glass envelope the filament would quickly burn up (X-ray production would NO LONGER
be possible)
4. Often made of borosilicate glass, metal, or ceramic
Tube Housing (Metal or Lead Housing) - correct answers -1. Prevents X-rays from being emitted
throughout the exam room
2. Must keep leakage radiation to maximum (0.88 mGy/hr)
Cathode - correct answers -Tungsten Filament
1
, Space Charge - correct answers -Cloud of FREE electrons
Space Charge Effect - correct answers -At 1000 mA, no more electrons can be forced out of the filament
Two Cathode Filaments (Dual Focus) - correct answers -Small Filament is 1 cm & Large Filament is 2 cm
Small Filament can on tolerate what - correct answers -Small mA, Small parts, Small exposures
Large Filament can on tolerate what - correct answers -Large mA, Large parts, Large exposures
Narrow beam results in - correct answers -High Spatial Resolution
Wide beam results in - correct answers -Low Spatial Resolution
Focusing Cup - correct answers -1. To focus the electron beam
2. Electrons & focusing cup negatively charged
Two types of Anodes are - correct answers -rotating and stationary
Stationary Anode - correct answers -1. Electron beam is focus onto one small area on the anode
2. All of the heat is focus onto one small area on the anode
3. Simple Design, Low heat capacity, Low exposures
2
