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IEC 60627:2013- Diagnostic X-ray imaging equipment – Characteristics of general purpose and mammographic anti-scatter grids
The operation of the bowtie filter in x-ray CT is correct if the object being scanned
is properly centered in the scanner’s field-of-view. Otherwise, the dose delivered to the
patient and image noise will deviate from optimal setting. We investigate the effect of miscen-
tering on image noise and surface dose on three commercial CT scanners. Six cylindrical phan-
toms with different size and material were scanned on each scanner. The phantoms were
positioned at 0, 2, 4 and 6 cm below the isocenter of the scanner’s field-of-view. Regression
models of surface dose and noise were produced as a function of miscentering magnitude
and phantom’s size. 480 patients were assessed using the calculated regression models to esti-
mate the influence of patient miscentering on image noise and patient surface dose in seven
imaging centers. For the 64-slice CT scanner, the maximum increase of surface dose using the
CTDI-32 phantom was 13.5%, 33.3% and 51.1% for miscenterings of 2, 4 and 6 cm, respectively.
The analysis of patients’ scout scans showed miscentering of 2.2 cm in average below the iso-
center. An average increase of 23% and 7% was observed for patient dose and image noise,
respectively. The maximum variation in patient miscentering derived from the comparison
of imaging centers using the same scanner was 1.6 cm.
دانلود کتاب ضروریات فیزیک سیستم های تصویربرداری Essential Physics of Medical Imaging, 3E بوشبرگ ویرایش سوم زبان اصلی
کتابی بسیار جامع در مورد فیزیک سیستم های تصویربرداری
حجم فایل: 29 مگابایت
کتاب Armstrong Diagnostic Imaging زبان اصلی
ویرایش 7
تصویربرداری تشخیصی آرمسترانگ
حجم فایل: 119 مگابایت
کتاب Armstrong Diagnostic Imaging زبان اصلی
ویرایش 7
تصویربرداری تشخیصی آرمسترانگ
حجم فایل: 119 مگابایت