نسخه کامل کتاب Impact Strength of Materials نویسنده William Johnson

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نسخه کامل کتاب Impact Strength of Materials نویسنده William Johnson

Edward Arnold, 1972 - Technology & Engineering - 361 pages

مقاله : Impact of miscentering on patient dose and image noise in x-ray CT imaging Phantom and clinical studies

اختصاصی از فی بوو مقاله : Impact of miscentering on patient dose and image noise in x-ray CT imaging Phantom and clinical studies دانلود با لینک مستقیم و پر سرعت .

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.

Classificatory income smoothing The impact of a change in regime of reporting financial performance

اختصاصی از فی بوو Classificatory income smoothing The impact of a change in regime of reporting financial performance دانلود با لینک مستقیم و پر سرعت .

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  Classificatory income smoothing The impact of a change in regime of reporting financial performance

که مقاله ای بسیار عالی در زمینه ی حسابداری است. توصیه میکنم که دانشجویان حسابداری جهت ارائه به صورت کنفرانس یا پروژه آن را دانلود نمایند.

Classificatory income smoothing The impact of a change in regime of reporting financial performance

اختصاصی از فی بوو Classificatory income smoothing The impact of a change in regime of reporting financial performance دانلود با لینک مستقیم و پر سرعت .

توضیحات :

دانلود یک مقاله ی کاربردی با زبان اصلی با موضوع:

  Classificatory income smoothing The impact of a change in regime of reporting financial performance

که مقاله ای بسیار عالی در زمینه ی حسابداری است. توصیه میکنم که دانشجویان حسابداری جهت ارائه به صورت کنفرانس یا پروژه آن را دانلود نمایند.

Classificatory income smoothing The impact of a change in regime of reporting financial performance

اختصاصی از فی بوو Classificatory income smoothing The impact of a change in regime of reporting financial performance دانلود با لینک مستقیم و پر سرعت .

توضیحات :

دانلود یک مقاله ی کاربردی با زبان اصلی با موضوع:

  Classificatory income smoothing The impact of a change in regime of reporting financial performance

که مقاله ای بسیار عالی در زمینه ی حسابداری است. توصیه میکنم که دانشجویان حسابداری جهت ارائه به صورت کنفرانس یا پروژه آن را دانلود نمایند.