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British Journal of Radiology (2006) 79, 487-496
© 2006 British Institute of Radiology
doi: 10.1259/bjr/16187818
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Organ doses from prostate radiotherapy and associated concomitant exposures

R M Harrison, PhD1, M Wilkinson, DCR(T)1, A Shemilt, BSc1, D J Rawlings, MPhil1, M Moore1 and A R Lecomber, PhD2

1 Regional Medical Physics Department, Newcastle General Hospital, Newcastle upon Tyne NE4 6BE , 2 Regional Medical Physics Department, Royal Victoria Infirmary, Newcastle upon Tyne NE1 4PP, UK


Figure 1
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  		Figure 1. Plan for prostate treatment simulation on slab 34 of a RANDO phantom(a) phase 1 treatment (64 Gy) and (b) phase 2 treatment to a smaller target volume (10 Gy).

 

Figure 2
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  		Figure 2. Digitally reconstructed AP radiograph of the RANDO phantom with target and critical volumes outlined. The prostate is shown in yellow with a red margin for the clinical target volume(CTV). The bladder is shown in orange and the rectum in dark red. The planning target volume (PTV) is demarcated by yellow lines.

 

Figure 3
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  		Figure 3. Neutron dose(direct, scattered and thermal) as a function of distance from the isocentre normal to the central axis of the beam. These values have been calculated from equation 1 using a = 0.85, Q = 0.21x1012 neutrons Gy–1 and S = (180x104) cm2.

 

Figure 4
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  		Figure 4. Organ doses from radiotherapy(photons and neutrons), 10 CT scans and 36 portal images for each organ or tissue (a) total doses for each organ and (b) % contribution of radiotherapy, CT scanning and portal imaging. Mean bladder, colon and rectal doses were 29.9 Gy, 2.8 Gy and 25 Gy, respectively.

 

Figure 5
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  		Figure 5. Organ doses from radiotherapy(photons and neutrons), 26 CT scans and 4 portal images for each organ or tissue (a) total doses for each organ and (b) % contribution of radiotherapy, CT scanning and portal imaging. Mean bladder, colon and rectal doses were 29.2 Gy, 2.7 Gy and 24.3 Gy, respectively.

 

Figure 6
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  		Figure 6. Mean dose in each slicevs distance from isocentre normal to the central axis, as a percentage of the target dose (74 Gy). Each slab of the RANDO phantom is 2.5 cm thick. Error bars represent±1 SD of the doses measured in each slab.

 

Figure 7
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  		Figure 7. Delivered- measured dose as a fraction of the delivered dose for 11 TLD measurement points within slab 34 of the RANDO phantom. Error bars represent the uncertainty in a single TLD measurement (± 4.3%).

 




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