Companding technique for high dynamic range measurements using Gafchromic films

Medical Physics

Volumn 38, Issue 12, 2011, Pages 6443-6448

  Van Den Heuvel, Frank ^a   Crijns, Wouter ^a   Defraene, Gilles ^a  

^a UNIVERSITY OF LEUVEN   (Belgium)

Author keywords

Gafchromic film dosimetry; noise reduction; radiation measurement; Small fields

Indexed keywords

NOISE ABATEMENT;

BEAM CHARACTERISTICS; COMPANDING TECHNIQUE; GAFCHROMIC FILMS; HIGH DYNAMIC RANGE; HIGH-RESOLUTION MEASUREMENTS; RADIATION MEASUREMENTS; SMALL FIELDS; SUPERIOR RESOLUTION;

COMPANDOR CIRCUITS;

EID: 82755163870     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.3656959     Document Type: Article

References (15)

1. A. B. Clark, Electrical picture-transmitting system., U.S. patent 1691147 (1928).
2. R. Dolby, An audio noise reduction system., J. Audio Eng. Soc. 15 (4), 383-388 (1967).
3. S. W. Smith, Audio processing., in The Scientist and Engineer's Guide to Digital Signal Processing (California Technical Publishing, San Diego, CA, 1997).
4. ISP International Specialty Products, 1361 Alps Road, Wayne, New Jersey, 07470, USA.
5. W. Crijns, F. Maes, and F. Van den Heuvel, Gafchromic film dosimetry: Calibration methodology and error analysis., http://arxiv.org/abs/1107.3780.
6. A. Micke, D. F. Lewis, and X. Yu, Multichannel film dosimetry with nonuniformity correction., Med. Phys. 38 (5), 2523-2534 (2011). 10.1118/1.3576105
7. L. J. van Battum and H. Huizenga, The curvature of sensitometric curves for Kodak XV-2 film irradiated with photon and electron beams., Med. Phys. 33, 2396-2403 (2006). 10.1118/1.2207130 (Pubitemid 43967227)
8. X. R. Zhu, S. Yoo, P. A. Jursinic, D. F. Grimm, F. Lopez, J. J. Rownd, and M. T. Gillin, Characteristics of sensitometric curves of radiographic films., Med. Phys. 30, 912-919 (2003). 10.1118/1.1568979 (Pubitemid 36578695)
9. J. F. Williamson, F.M. Khan, and S. C. Sharma, Film dosimetry of megavoltage photon beam: A practical method of isodensity-to-isodose curve conversion., Med. Phys. 8, 94-98 (1981). 10.1118/1.594913 (Pubitemid 11138711)
10. N. L. Childress, L. Dong, and I. I. Rosen, Rapid radiographic film calibration for IMRT verification using automated MLC fields., Med. Phys. 29, 2384-2390 (2002). 10.1118/1.1509441 (Pubitemid 35204447)
11. D. Georg, B. Kroupa, P. Winkler, and R. Potter, Normalized sensitometric curves for the verification of hybrid IMRT treatment plans with multiple energies., Med. Phys. 30, 1142-1150 (2003). 10.1118/1.1576951 (Pubitemid 36735981)
12. T. F. Coleman and Y. Li, On the convergence of interior-reflective Newton methods for nonlinear minimization subject to bounds., Math. Program. 67 (1), 189-224 (1994). 10.1007/BF01582221
13. G. Defraene and F. Van den Heuvel, Peripheral doses in prostate cancer radiotherapy: A comparison between IMRT and RapidArc treatments., Radiother. Oncol. 99 (Suppl. 1), S127-S127 (2011). 10.1016/S0167-8140(11)70441-8
14. M. Durante, L. Sihver, E. Aird, B.A. Jereczek-Fossa, and F. Van den Heuvel, Dosimetry for normal tissue risk assessment: Measurement and calculation of the doses received by normal tissues from radiation therapy from current and emerging modalities., Radiother. Oncol. 99 (Suppl. 1), S46-S46 (2011). 10.1016/S0167-8140(11)70245-6
15. PTW Freiburg Lrracher Strasse 7 79115 Freiburg, Germany