Daily cone-beam computed tomography used to determine tumour shrinkage and localisation in lung cancer patients

Figures & data

Figure 1. GTV-t volume changes versus days since start of treatment in patients who demonstrated (a) shrinkage of more than 15% and (b) shrinkage less than 15%.

Figure 2. GTV-n volume changes versus days since start of treatment.

Figure 3. Distribution of the 3D shifts from the skin tattoos to the soft tissue matching using the ITV.

Table I. Setup errors obtained by a. aligning to skin tattoos without image guidance and b. bony anatomy matching both in comparison to the soft tissue matching using the ITV. Values are given for the overall mean, M, the systematic errors, Σ, the random errors, σ, and calculated margins.

	a. Skin tattoo			b. Bony anatomy
	SI (mm)	AP (mm)	LR (mm)	SI (mm)	AP (mm)	LR (mm)
M	2.4	1.7	0.4	0.3	0.1	0.4
Σ	4.0	2.5	3.0	1.8	1.1	1.4
σ	3.4	3.0	2.5	1.5	1.1	1.0
Margin	12.3	8.4	9.3	5.6	3.5	4.3

Figure 4. Distribution of the 3D shifts from the bony anatomy match to the soft tissue match using the ITV.

Figure 5. Distribution of the distance between GTV-t and GTV-n for the SI, AP, and LR directions and for the 3D vector for all CBCT scans.