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Macroradiography using conventional radiographic X-ray equipment

R A Davidson, BBus, MIR, GAIP 1 and S Bowman, PhD, MA, SRR 2

1 School of Clinical Sciences, Charles Sturt University, Booroma Road, Wagga Wagga NSW 2678 and 2 Whyalla Campus, University of South Australia, Whyalla SA 5600, Australia



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  		Figure 1. Diagrammatic representation of positional-dependent effective focal spot size (Eff FSS). DB (when {phi} positive, or D'B when {phi} negative), positional-dependent Eff FSS; AB, Eff FSS given by the manufacturer (measured at the point of the central ray); CB, actual FSS; {theta}, target angle given by the manufacturer; {phi}, angle of the beam of the positional-dependent effective focal spot.

 


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  		Figure 2. Pinhole camera focal spot images. (A) Angle of the positional-dependent effective focal spot ({phi}) of -10°. (B) Angle of the positional-dependent effective focal spot ({phi}) of 0°.

 


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  		Figure 3. Macroradiograph of line pair phantoms at magnification factor of 2. (A) Angle of 0°; measured positional-dependent effective focal spot size (Eff FSS) of 0.76 mm. (B) Angle of -10°; measured positional-dependent Eff FSS of 0.14 mm.

 


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  		Figure 4. Macroradiograph of hand-wrist phantom: magnification factor of 2; angle of 0°; measured positional-dependent effective focal spot size of 0.76 mm.

 


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  		Figure 5. Macroradiograph of hand-wrist phantom: magnification factor of 2; angle of -10°; long axis of trabecular pattern parallel to cathode–anode axis (fingers pointing parallel to cathode–anode axis); measured positional-dependent effective focal spot size of 0.14 mm.

 


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  		Figure 6. Macroradiograph of hand-wrist phantom: magnification factor of 2; angle of -10°; long axis of trabecular pattern at 90° to cathode–anode axis (fingers pointing at 90° to cathode–anode axis); measured positional-dependent effective focal spot size of 0.14 mm.

 




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