Physics Bucharest 2017

Off-line observational studies

Margins applied to bladder (CTV)

Number of patients in whom bladder excursions were encompassed by target volume used

Study (year)

Imaging technique

n

Ant Post Sup Inf

Lat

Sur et al., (1993)

Planning CT, repeated halfway through treatment Planning CT, repeated weekly through treatment Planning CT, repeated halfway through and end of treatment Planning CT, repeated weekly through treatment

90

1.0-2.0 isotropic

80%

67% (33% had at least one incidence of wall movement >15 mm)

Turner et al., (1997)

30

1.5-2.0 isotropic

Harris et al., (1998)

20

1.0-2.0 isotropic

80%

35% (71%, GTV received at least 95% of dose on weekly scans)

Pos et al., (2003)

17

1.5-2.0 isotropic

1.1 (L) 0.8 (R)

Muren et al., (2003)

84%

Planning CT, weekly CT (and EPI)

20

2.0 1.4 2.0 1.0

24

3 PTVs created