VOL. XXI, N. 2, 2005, April-June	page
Original Papers
Maha A. Ali, Ismail Emam Validation of a Simple Analytical Model for In-air Output Factor Calculation for SL-15 Philips-Elekta Linear Accelerator abstract	55
Chunsheng Wang, Gary X. Shen, Jin Yuan, Peng Qu, Bing Wu Theoretical and Experimental Investigation of the Relationship among SAR, Tissues and Radio Frequencies in MRI abstract	61
Panagiotis Sandilos, Theodoros Paschalis, Pantelis Karaiskos, Konstantinos Dardoufas, Lambros Vlachos Quality assurance of Siemen’s Virtual Wedge^TM by using film dosimetry abstract	65
Esam E. T. E. A. Mohamed, Stefan Gröger, Jürgen Schiller, Frank Stallmach, Jörg Kärger, Klaus Arnold The Self-Diffusion Behavior of Polyethylene Glycol in Cartilage as Studied by Pulsed-Field Gradient NMR abstract	69
Technical Note
Basri Günhan, Songül Karacam, Ayse Koca, Bayram Demir, Dervis Emre, Nil Akin Depth dose characteristics of electron beams at extended SSDS abstract	75
Letter to the Editor
Romano Zannoli, Luciano Potena, Angelo Branzi Nitrates and Angina: an insight into arterial and venular involvment in blood flow regulation abstract	81