Table 1.

 Estimated depth of damage for various methods of endoscopic mucosal ablation

Method of ablation	Approximate depth of ablation (mm)	Author/ref
Argon laser (514 nm)	0.3	Weston 200350
KTP laser (532 nm)	0.4	Dix 199635
Diode laser (805 nm)	1.3	Dix 199635
NdYAG laser (1064 nm)	4–6	Dix 199635
APC (30–90 W)	1–3	Barham 1996,31 Franchimont 200332
MPEC 15–20 W	1.7–4.8	Sampliner 200330
ALA PDT	2	Tan 1999,41 Gossner 199040
Exogenous PDT	4–6	Barr 1990,39 Heier 199538
Cryotherapy	1–4	Johnston 200329

KTP, potassium titanyl phosphate; NdYAG, neodymium yttrium aluminium garnet; APC, argon beam plasma coagulation; MPEC, multipolar electrocoagulation; ALA PDT, 5-aminolaevulinic acid photodynamic therapy.