A parallel grid is designed with 0.05 mm thickness and 4 mm high grid strips separated by 0.4mm aluminum spacers.  The ratio for this grid is

The dose rate at 50cm from a source is 75 mR per hour.  What is the dose rate in mR per hour at 90cm for this same source?

Most of the digestive tract organs are contained within a double-walled membrane called the 

Lower spatial resolution may be caused by which of the following factors?

Which of the following are methods that can be used by a C-arm operator to reduce occupational exposure for himself and other personnel?                       1.  collimate the x-ray beam to include only the anatomy of                                interest.                        2.  use the foot pedal or hand held exposure switch with their                             cables extended away from the machine as far as possible,                             whenever making an exposure                       3.  use magnification whenever possible to better visualize the                              body parts

Of the following groups of technical factors, which will produce the greatest receptor exposure?

How many half value layers will it take to reduce an x-ray beam whose intensity is 78R/min to an intensity of less than 10R/min?

Among the principal factors that must be considered when developing a technique chart for an automatic exposure controlled unit are:          1.  kVp range          2.  number of sensors          3.  degree of beam restriction

On the lateral projection of the scapula, the upper part of the scapula is demonstrated as the letter ‘Y’.  The superior aspect of the ‘Y’ is formed by the

When a pin hole or resolution phantom test is performed for focal spot size measurements, the hole of the phantom should be located: