Three-dimensional radiation dosimetry using polymer gel and solid radiochromic polymer: From basics to clinical applications

Table 6 Precision (or uncertainty) of three-dimensional dosimetry[22]

Uncertainty type	Source	Factor	PGD	FGD	SPD
A	Physicochemical	Chemical composition	< 2%		< 2%
		Temperature variation
		Temporal and spatial integrity
	Irradiation	Dose rate
		Energy
		Temperature			2%
		Phantom position setup	1 mm
	MRI	Image noise	< 0.4% (3 mm3)
	OCT	Image noise
	XCT	The standard deviation of CT number	2% to 8%
B	MRI	B0 non-uniformity	< 3%
		B1 non-uniformity
		Gradient non-uniformity
		Temperature during scanning
	Medium	Non-uniform refractive index
	OCT	Refractive index matching
		Unstable light source
		Ambient stray light
		Desynchronization between galvanic mirror and detector
		Misalignment of light, subject, and detector
	XCT	Image processing	5%
		Calibration equation

MRI: Magnetic resonance imaging; OCT: Optical computer tomography; XCT: X-ray computed tomography; FGD: Ferrous gel dosimeter; PGD: Polymer gel dosimeter; SPD: Solid plastic dosimeter.