Tables at a glance

Table 1

Table 2

Table 3

Figures at a glance

Comments

Figure 1

Comments

Figure 2

Comments

Figure 3

Comments

Figure 4

Comments

Figure 5

Comments

Figure 6

Table 1

Head and Neck

Prostate

Critical organ

Dose (EQD2)/ Volume

Critical organ

Dose (EQD2)/ Volume

Brain

V60 Gy ≤ 30 %

Small Bowel

Dmax = 46 Gy Daverage ≤ 30 Gy

Lens

Dmax = 4 Gy

Eye

Dmax = 45 Gy

Rectum

V50Gy ≤ 50 % V60Gy ≤ 40 %
V75Gy ≤ 15 %

Esophagus and Lacrimal gland

Daverage ≤ 34 Gy

Chiasm and Optical nerve

V54Gy ≤ 2 %

Bladder

Daverage ≤ 62 Gy

Cochlea

Daverage ≤ 40 Gy

Penile bulb

Daverage ≤ 50 Gy

Brain stem

V60Gy ≤ 2 %

Testicle

Dmax = 8 Gy

Spinal cord

Dmax = 48 Gy

Ovaries

Dmax = 2 Gy

Parotid gland

Daverage ≤ 26 Gy

Femoral head

Dmax = 55 Gy

Larynx

V50Gy ≤ 30 %

Sacrum

Daverage ≤ 50 Gy

Table 1 : Dose Volume Objectives/ Constraints to critical organs

Table 2

Case	Patient	Dose (Gy)			Percentage dose difference (%)
Case	Patient	TPS calculated	Measured	Difference	Percentage dose difference (%)
Prostate	1	3.08	3.07	0.01	0.43
	2	3.08	3.06	0.03	0.90
	3	4.47	4.46	0.01	0.16
	4	3.37	3.34	0.02	0.70
	5	2.58	2.58	0.00	0.17
Head-and-neck	6	2.72	2.73	0.01	0.24
	7	2.85	2.85	0.00	0.16
	8	3.41	3.40	0.01	0.36
	9	2.24	2.22	0.02	0.71
	10	3.11	3.11	0.00	0.07

Table 2: Comparison of ionization chamber measured and TPS calculated doses for the IMRT plans

Table 3

Case	Patient	Pass rates (%)
Case	Patient	1st verification	2nd verification	3rd verification	Mean ± SD
Prostate	1	97.50	97.20	98.10	97.60 ± 0.46
	2	95.40	95.40	96.60	95.80 ± 0.69
	3	96.10	96.80	97.40	96.77 ± 0.65
	4	98.30	97.90	99.10	98.43 ± 0.61
	5	95.40	96.00	95.10	95.50 ± 0.46
Head-and-neck	6	93.70	95.00	95.10	94.60 ± 0.78
	7	96.50	96.90	96.90	96.77 ± 0.23
	8	96.50	97.10	96.80	96.80 ± 0.30
	9	96.30	95.80	96.60	96.23 ± 0.40
	10	97.10	97.80	98.20	97.70 ± 0.56

Table 3: Gamma passing rates for the various IMRT plans and different verifications

FIGURE 1

Figure 1: CT scanning of the miniPhantom with the MatriXX 2D array detector embedded in it

FIGURE 2

Figure 2: Axial CT slice of the miniPhantom and 2D array detector

FIGURE 3

Figure 3: TPS planning window: A. prostate IMRT plan, B. Verification plan

FIGURE 4

Figure 4: Treatment delivery with the miniPhantom having the MatriXX detector inserted into the phantom

FIGURE 5

Figure 5: Dose comparison window of myQA software

FIGURE 6

Figure 6(a): Gamma passing rates of IMRT plans for (a) prostate

Figure 6(b): Gamma passing rates of IMRT plans for (b) head-and-neck cases