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British Journal of Radiology (2003) 76, 464-472
© 2003 British Institute of Radiology
doi: 10.1259/bjr/82965103
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Use of a quality index in threshold contrast detail detection measurements in television fluoroscopy

D J Gallacher, MPhil1, A Mackenzie, MSc2, S Batchelor, MSc1, J Lynch, MSc3 and J E Saunders, BSc4

1 Medical Physics Department, Guy's and St Thomas' Hospital, London SE1 7EH, 2 King's Centre for Assessment of Radiological Equipment (KCARE), King's Hospital, London, 3 Medical Physics Department, Princess Margaret Hospital, Swindon and 4 Formerly Medical Physics Department, Guy's and St Thomas' Hospital Trust, London SE1 7EH, UK



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  		Figure 1. Comparison of the standard threshold detection index plots relating to 25 cm field of view versus detail diameter. {triangleup}=F25, FAXIL Data (F25, 1992); x =STB1, STB/7/82 New Systems Data (DOH, 1982); +=STB2, STB/7/82 Systems of age 5 years (DOH, 1982).

 


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  		Figure 2. Three 25 cm field of view curves best fit normalized to the FAXIL F25 (upper curve) versus detail diameter. {triangleup}=F25, FAXIL Data (F25, 1992); x =STB1, STB/7/82 New Systems Data (DOH, 1982); +=STB2, STB/7/82 Systems of age 5 years (DOH, 1982).

 


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  		Figure 3. FAXIL data curves for 30/36 cm, 25 cm, 15/17 cm field of view versus apparent detail size. {square}=F33, FAXIL Data (F33, 1992); {triangleup}=F25, FAXIL Data (F25, 1992); {circ}=F16, FAXIL Data (F16, 1992).

 


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  		Figure 4. Best root mean square difference fit normalized curves for 30/36 cm, 25 cm and 15/17 cm versus apparent detail size. {square}=Normalized F33 to F25; {triangleup}=F25, FAXIL Data (F25, 1992); {circ}=Normalized F16 to F25.

 




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