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Radiographic contrast is dependant on:
Subject contrast and film contrast are the two factors that comprise radiographic:
Contrast and definition are the two major factors that determine the of the radiograph:
Contrast is defined as the comparison between on different areas of the radiograph:
A 70-year-old man with an 80-pack-year smoking history is evaluated because of a chronic cough of 6 months duration. Chest radiograph shows a 3-cm mass in the left perihilar region, and bronchoscopic biopsy confirms poorly differentiated adenocarcinoma. There are no significant findings on physical examination, and all blood studies are normal. Bone scan and CT scan of the head are normal, but CT scans of the chest and abdomen show the mass and two 1-cm nodules in the right lobe of the liver. Intravenous contrast perfusion of the two nodules during the CT scan is not suspicious for hemangioma. Positron emission tomography scan shows distinct uptake in the left perihilar mass but only faint focal activity in the right lobe of the liver.Pulmonary function tests show mild obstructive disease. What is the best next step in this patient‟s management?
Radiographic enlargement to distinguish small defects is possible:
Radiographic film speed can be increased by using:
Radiographic equivalence factors for Inconel and 304 stainless steel are 1.4 and 1.0 respectively. What is the approximate equivalent thickness of Inconel requiring the same exposure as 1.27 cm (½ inch) thickness of 304 stainless steel?
A radiographic sensitivity level of 2-2T means that:
A radiographic indication in a weld, characterised by two parallel dark lines in the film image, would probably be caused by:
Unacceptable radiographic film quality would be indicated by:
When radiographic energy is decreased:
A radiographic exposure with 3700 GBq (100 Ci) source of Ir-192 using source to film distance of 60 cm results in a radiation intensity of 0.12 Gy/h (11.8 R/h) and a radiographic density of 2.5. The intensity of radiation needed to obtain the same density when the source to film distance is changed to120 cm is:
In the radiographic analysis procedure that is used to prepare an exposure chart, the first step is to:
Static marks on radiographic film are caused by:
Of the following radiographic sources, which emits the most penetrating radiation?
An exposed radiographic film which transmits 1% of the light incident on it has what density:
For gamma ray sources, radiographic intensity is proportional to source activity in gigabecquerels or curies for:
The approximate radiographic equivalence factors for steel and copper at 220 kV are 1.0 and 1.4 respectively. If it is desirable to radiograph a 1.27 cm (0.5 inch) piece of copper, what thickness of steel would require about the same exposure characteristics?
Most scattered radiation which adversely affects the radiographic image quality originates: