1. Determination of half value layers of X-ray equipment using computed radiography imaging plates 
Eiji Ariga, Shigeki Ito, Shizuhiko Deji, Takuya Saze, Kunihide Nishizawa 
Physica Medica: European Journal of Medical Physics 
Volume 28, Issue 1, Pages (January 2012)
DOI: /j.ejmp
Copyright © 2011 Associazione Italiana di Fisica Medica Terms and Conditions

2. Figure 1
Layout of air kerma measurement. (a) Ionization chamber, and (b) IP.
Physica Medica: European Journal of Medical Physics  , 71-75DOI: ( /j.ejmp )
Copyright © 2011 Associazione Italiana di Fisica Medica Terms and Conditions

3. Figure 2
Dependency of coefficient ‘a’ on absorber thicknesses and tube voltage when coefficient ‘b’ is
Physica Medica: European Journal of Medical Physics  , 71-75DOI: ( /j.ejmp )
Copyright © 2011 Associazione Italiana di Fisica Medica Terms and Conditions

4. Figure 3
Transmission curves of air kermas obtained with ionization chamber and IP. Air kerma values were measured with an ionization chamber, and calculated with the modified Eq. (2). Tube voltage: 80kV, Additional filtration: 0mm Al.
Physica Medica: European Journal of Medical Physics  , 71-75DOI: ( /j.ejmp )
Copyright © 2011 Associazione Italiana di Fisica Medica Terms and Conditions

5. Figure 4
Relative transmission curves obtained by normalizing the transmission curves in Fig. 3 to the 0 absorber thickness.
Physica Medica: European Journal of Medical Physics  , 71-75DOI: ( /j.ejmp )
Copyright © 2011 Associazione Italiana di Fisica Medica Terms and Conditions

6. Figure 5
Comparison between HVLch and HVLIP. HVLch, HVL determined with the ionization chamber; HVLIP, HVL determined with IP using the modified equation. Ideal line, A line where HVLIP completely coincides with HVLch. HVLch and HVLIP were determined for 64 combinations of 8 tube voltages of 50, 60, 70, 80, 90, 100, 110, and 120kV, and 8 additional filtrations of 0, 0.2, 0.4, 0.6, 1.0, 1.5, 2.0, and 2.5mm Al.
Physica Medica: European Journal of Medical Physics  , 71-75DOI: ( /j.ejmp )
Copyright © 2011 Associazione Italiana di Fisica Medica Terms and Conditions

7. Figure 6
Relative discrepancies between HVLch and HVLIP. HVLch, HVL determined with the ionization chamber. HVLIP, HVL determined with IP using the modified equation. Relative discrepancies were determined for 64 combinations of 8 tube voltages of 50, 60, 70, 80, 90, 100, 110 and 120kV, and 8 additional filtrations of 0, 0.2, 0.4, 0.6, 1.0, 1.5, 2.0, and 2.5mm Al.
Physica Medica: European Journal of Medical Physics  , 71-75DOI: ( /j.ejmp )
Copyright © 2011 Associazione Italiana di Fisica Medica Terms and Conditions