PRINCIPLES OF ATCM TECHNIQUES
Unlike in conventional radiography, during CT scanning the x-ray tube continuously
rotates around the patient, emitting x-rays that traverse through a cross section of the
body to generate attenuation profiles (image raw data) at the detectors. Thus, incident
x-ray beam projections from multiple directions around the region of interest are used to
reconstruct each cross-sectional CT image. Scanning parameters such as tube current and
tube potential determine photon fluence and incident beam energy, which affect image
quality and absorbed radiation dose. With other scanning parameters held constant, a
reduction in tube current decreases radiation exposure but increases image noise or mottle,
a principle determinant of image quality. Likewise, an increase in tube current leads to an
increase in radiation exposure and a decrease in image noise. On a scale of diagnostic
acceptability, image noise and radiation exposure represent conflicting factors, and disproportionate
emphasis on either factor may have an adverse effect on image quality or
radiation dose. Whereas images with lower noise (increased radiation exposure) may not
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PRINCIPLES OF ATCM TECHNIQUESUnlike in conventional radiography, during CT scanning the x-ray tube continuouslyrotates around the patient, emitting x-rays that traverse through a cross section of thebody to generate attenuation profiles (image raw data) at the detectors. Thus, incidentx-ray beam projections from multiple directions around the region of interest are used toreconstruct each cross-sectional CT image. Scanning parameters such as tube current andtube potential determine photon fluence and incident beam energy, which affect imagequality and absorbed radiation dose. With other scanning parameters held constant, areduction in tube current decreases radiation exposure but increases image noise or mottle,a principle determinant of image quality. Likewise, an increase in tube current leads to anincrease in radiation exposure and a decrease in image noise. On a scale of diagnosticacceptability, image noise and radiation exposure represent conflicting factors, and disproportionateemphasis on either factor may have an adverse effect on image quality orradiation dose. Whereas images with lower noise (increased radiation exposure) may notReview
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หลักการเทคนิค PRINCIPLES OF ATCM TECHNIQUES
ซึ่งแตกต่างจากการถ่ายภาพรังสีในการชุมนุมในช่วง Unlike in conventional radiography, during CT scanning the x-ray tube continuously
สแกนหลอดเอ็กซ์เรย์อย่างต่อเนื่องหมุนรอบผู้ป่วยเปล่งรังสีเอกซ์ที่ตัดผ่านข้ามส่วนของร่างกายในการสร้างรูปแบบการลดทอนrotates around the patient, emitting x-rays that traverse through a cross section of the
( ดังนั้นเหตุการณ์ที่เกิดขึ้นประมาณการลำแสงเอ็กซ์เรย์จากหลายทิศทางทั่วภูมิภาคที่น่าสนใจที่ใช้ในการสร้างภาพแต่ละภาพCT body to generate attenuation profiles (image raw data) at the detectors. Thus, incident
x-ray beam projections from multiple directions around the region of interest are used to
reconstruct each cross-sectional CT image. Scanning parameters such as tube current and
tube potential determine photon fluence and incident beam energy, which affect image
quality and absorbed radiation dose. With other scanning parameters held constant, a
reduction in tube current decreases radiation exposure but increases image noise or mottle,
a principle determinant of image quality. Likewise, an increase in tube current leads to an
increase in radiation exposure and a decrease in image noise. On a scale of diagnostic
acceptability, image noise and radiation exposure represent conflicting factors, and disproportionate
emphasis on either factor may have an adverse effect on image quality or
radiation dose. Whereas images with lower noise (increased radiation exposure) may not
Review
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