In that the exposure time for a linear tomographic image is long, the mA must be

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The exposure time for a linear tomographic image is long to ensure that enough X-ray photons pass through the body to create a clear image. To prevent excessive patient dose due to the long exposure time, the mA (milliamperage) must be kept low. This balances the need for sufficient image quality with the need to minimize radiation exposure to the patient.

In That the Exposure Time for a Linear Tomographic Image