Table 3.
Results of polynomial least-squares fits of the logarithm of normalized penetration versus lead thickness. Results listed as “fit parameter (standard error).”
| 60 kVp |
80 kVp |
100 kVp |
120 kVp |
|||||
|---|---|---|---|---|---|---|---|---|
| Fit parameter1 | P2 | S | P | S | P | S | P | S |
| a | … | 6.5392 | 5.1823 | 5.0837 | 4.2665 | 4.5214 | 3.6106 | 3.9349 |
| (0.1964) | (0.0388) | (0.1030) | (0.0144) | (0.0827) | (0.0203) | (0.0863) | ||
| b | … | −17.3547 | −11.3690 | −12.3351 | −9.1465 | −10.0647 | −8.2763 | −8.8824 |
| (0.1538) | (0.0310) | (0.0836) | (0.0115) | (0.0672) | (0.0168) | (0.0713) | ||
| c | … | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
1
y = ax2 + bx + c.
2
P = primary, S = scattered.