Monte Carlo simulation of eye lens dose reduction from CT scan using organ based tube current modulation |
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| Institution: | 1. Department of Radiology, Wan Fang Hospital, Taipei Medical University, 111 Hsing-Long Road, Section 3, Taipei, Taiwan;2. Department of Radiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan;3. Biostatistics Center, Taipei Medical University, Taipei, Taiwan;4. Graduate Institute of Nursing, Taipei Medical University, Taipei, Taiwan;5. Department of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas |
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| Abstract: | PurposeTo investigate lens dose reduction with organ based tube current modulation (TCM) using the Monte Carlo method.MethodsTo calculate lens dose with organ based TCM, 36 pairs of X-ray sources with bowtie filters were placed around the patient head using a projection angle interval of 10° for one rotation of Computed Tomography (CT). Each projection was simulated respectively. Both voxelized and stylized eye models and Chinese reference male phantoms were used in the simulation, and tube voltages 80, 100, 120 and 140 kVp were used.ResultsDose differences between two eye models were less than 20%, but large variations were observed among dose results from different projections of all tube voltages investigated. Dose results from 0° (AP) directions were 60 times greater than those from 180° (PA) directions, which enables organ based TCM reduce lens doses by more than 47%.ConclusionsOrgan based TCM may be used to reduce lens doses. Stylized eye models are more anatomically realistic compared with voxelized eye models and are more reliable for dose evaluation. |
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| Keywords: | Monte Carlo Eye lens dose Tube current modulation Eye model |
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