The effect of a limited number of projections and reconstruction algorithms on the image quality of megavoltage digital tomosynthesis.
In order to investigate the effect of the number of projections on digital tomosynthesis image quality, images were acquired over a 40 degree arc and sampled into sets of 2 to 41 projections used as input to three different reconstruction algorithms, namely the shift-and-add, Feldkamp-Davis-Kress filtered back projection algorithms, and the simultaneous algebraic reconstruction technique. The variation of several image characteristics, such as in-plane resolution, contrast to noise ratio, artifact spread, volumetric accuracy and dose, are investigated based on the reconstruction algorithms used and also the number of projections used as source data. The results suggest that the use of 11 projections along with the filtered back projection technique provides a good compromise for all aspects considered.
Sarkar
Vikren
V
Division of Medical Physics, CTRC at the University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
Shi
Chengyu
C
Division of Medical Physics, CTRC at the University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
Rassiah-Szegedi
Prema
P
Department of Radiation Oncology, University of Utah, Salt Lake City, UT, USA.
Diaz
Aidnag
A
Department of Radiation Oncology, CTRC at the University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
Eng
Tony
T
Department of Radiation Oncology, CTRC at the University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
Papanikolaou
Niko
N
Division of Medical Physics, CTRC at the University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
D000465:Algorithms; D006801:Humans; D019047:Phantoms, Imaging; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*
Int J Radiat Oncol Biol Phys. 2005 Feb 1;61(2):552-60
15736320
Med Dosim. 2002 Winter;27(4):271-3
12521073
Med Phys. 2007 Aug;34(8):3374-84
17879800
Cancer Radiother. 2007 Jan-Feb;11(1-2):23-31
17113331
Int J Radiat Oncol Biol Phys. 2006 Jan 1;64(1):289-300
16377417
Med Phys. 2008 Apr;35(4):1310-6
18491525
Med Phys. 1992 Jul-Aug;19(4):1045-50
1518466
Med Phys. 2007 Oct;34(10):3768-76
17985622
Med Phys. 2006 Oct;33(10):3781-95
17089843
Phys Med Biol. 1998 Jan;43(1):155-69
9483629
Phys Med Biol. 2008 Feb 21;53(4):999-1013
18263954
Med Phys. 2002 Dec;29(12):2913-24
12512728
Cancer Radiother. 2006 Sep;10(5):252-7
16884940
Med Phys. 2007 Feb;34(2):499-506
17388167
JOP. 2006 Jul 10;7(4):372-81
16832134
Med Phys. 2004 Sep;31(9):2636-47
15487747
Med Phys. 2005 Mar;32(3):819-29
15839355
Int J Radiat Oncol Biol Phys. 2006 May 1;65(1):8-15
16618573
Med Dosim. 2006 Spring;31(1):1-2
16551523