Hafiz M. Zin

Examination Two: Questions

Q1. The technique used to minimise motion blur includes: n n nA. Increasing the mA n n nB. Increasing the exposure time n n nC. Using a fast film-screen combination n n nD. Image magnification n n nE. Using a breath-hold technique

Examination Eight: Questions

Q1. Regarding the photographic emulsion of radiographic film: n n nA. It is made of silver halide crystals. n n nB. The emulsion layer is coated onto a base material. n n nC. The thickness of the emulsion is 1 mm. n n nD. It is sensitive to radiation. n n nE. It is sensitive to visible light.

Examination Seven; Questions

Q1. Regarding modulation transfer function (MTF): n n nA. It describes the image contrast of an imaging system. n n nB. It is based on Fourier analysis. n n nC. The MTF value increases with better visibility of small structures. n n nD. The MTF curve is specific to an imaging system. n n nE. The MTF value is not applicable for a digital system.

Examination Four: Questions

Q1. Regarding image receptor in digital radiography: n n nA. The image receptor is divided into a matrix of pixels. n n nB. Increasing the number of pixels reduces the spatial resolution. n n nC. Fill factor is the percentage of pixel area that is sensitive to radiation. n n nD. Signal in pixel array is read out using the associated electronic circuitry. n n nE. Each pixel contains a photoconductor.

Examination Five: Questions

Q1. Regarding display and post-processing of digital radiographic images: n n nA. Liquid crystal display (LCD) monitor utilises variation in light polarisation within the crystal for image visualisation. n n nB. The LCD monitor has to be calibrated to the DICOM standard to display images for primary diagnostic clinical interpretation n n nC. The size of a good quality digital image is over 10 megabytes of data. n n nD. Windowing improves spatial resolution. n n nE. Averaging a few images reduces the noise.

Examination One: Questions

Q1. Regarding digital radiographic image n n nA. A larger pixel size is required for a larger field of view if the number of pixels is the same n n nB. Increasing the pixel size increases the spatial resolution n n nC. The bit depth determines the number of greyscale range of a pixel n n nD. A 12-bit pixel stores up to 512 levels of grey n n nE. Lossless compression of an image causes degradation of the image quality

Examination Six: Questions

Q1. Picture archiving and communications system (PACS): n n nA. Stores digital radiographic images in DICOM format n n nB. Removes the need for film storage n n nC. Cannot be accessed from different locations simultaneously n n nD. Compresses the stored images to help reduce the storage requirement n n nE. Use Health Level Seven (HL7) standard

Examination Three: Questions

Q1. Overall detection efficiency of a detector in nuclear medicine department is affected by: n n nA. Quantum detection efficiency n n nB. Intrinsic efficiency n n nC. Photopeak efficiency n n nD. Geometric design of the detector n n nE. Distance of the source from the detector

Examination Nine: Questions

Q1. Optical density is: n n nA. The ratio of incident light to transmitted light in logarithmic form n n nB. Measured using densitometer n n nC. A measure of the degree of film darkening n n nD. Referred as radiographic density n n nE. 1.0 if 100% of the incident light is transmitted

Examination Two: Answers

A1. The technique used to minimise motion blur includes: n n nA. True. Increasing the tube current will shorten the exposure time and reduces the motion captured. n n nB. False. Increasing the exposure time will prolong the imaging time and increases the motion captured. n n nC. True. Using fast film-screen reduces exposure time required and reduces the motion captured. n n nD. False. Image magnification will magnify any motion blur. n n nE. True. Breath hold minimises organ motion captured and reduces blurring in the image.