Mixed Deck — All Radiography Exam Topics Flashcards

What is the purpose of a quality audit in Radiography Exam practice?

Answer: To systematically evaluate processes against standards and identify improvement opportunities

This is fundamental to Radiography Exam practice. To systematically evaluate processes against standards and identify improvement opportunities represents the professional standard for quality in the Radiography Exam certification framework.

What is the inverse square law as applied to X-ray intensity?

Answer: Intensity is inversely proportional to the square of the distance from the source

The inverse square law states that radiation intensity decreases as the inverse square of the distance from the source (I1/I2 = D2²/D1²).

Which law prohibits Medicare and Medicaid fraud, including billing for services not rendered or upcoding procedures?

Answer: False Claims Act

The False Claims Act (31 U.S.C. §§ 3729–3733) prohibits knowingly submitting false or fraudulent claims to federal healthcare programs. Violations can result in treble damages, civil monetary penalties, and criminal prosecution.

Which patient condition requires the greatest caution and individualized risk-benefit assessment before administering iodinated IV contrast?

Answer: Chronic kidney disease with eGFR 20 mL/min/1.73m²

An eGFR of 20 mL/min/1.73m² represents severe chronic kidney disease, placing the patient at significant risk for contrast-induced acute kidney injury and requiring careful risk-benefit evaluation.

In CT, the term 'effective mAs' accounts for pitch and is calculated as:

Answer: mAs / pitch

Effective mAs = mAs / pitch. It normalizes the mAs for pitch, allowing meaningful dose comparisons between protocols with different pitches. Higher pitch = lower effective mAs = less dose.

Which of the following actions is required when a pregnant radiographer declares her pregnancy to the employer?

Answer: A supplemental fetal dose monitor must be provided and dose management strategies discussed

Upon voluntary declaration of pregnancy, the facility must provide a fetal dosimeter (worn at the abdomen under the lead apron), discuss the 5 mSv dose limit for the gestational period, and review applicable work assignments to keep fetal dose ALARA.

What is the value of written documentation in Radiography Exam professional communication?

Answer: It creates permanent records, ensures clarity, and provides legal protection

This is fundamental to Radiography Exam practice. It creates permanent records, ensures clarity, and provides legal protection represents the professional standard for communication in the Radiography Exam certification framework.

When evaluating monitor quality for diagnostic radiology, the minimum luminance ratio (maximum to minimum luminance) and the maximum luminance for primary diagnostic displays should be:

Answer: Luminance ratio ≥ 250:1 and maximum luminance ≥ 350 cd/m²

AAPM TG-18 recommends primary diagnostic displays have a maximum luminance ≥ 350 cd/m² and a luminance ratio (Lmax/Lmin) ≥ 250:1 to adequately display the full diagnostic gray scale.

A radiographer notices that a patient's blood pressure is 90/60 mmHg and the patient is diaphoretic. What is the BEST initial action?

Answer: Notify the radiologist or supervising physician immediately

Hypotension (90/60) with diaphoresis may indicate shock or a serious medical event; the radiographer must immediately notify the supervising physician.

On a lateral cervical spine radiograph, the prevertebral soft tissue space at C3 normally measures no more than:

Answer: 7 mm (or one-third the AP width of the adjacent vertebral body)

The prevertebral soft tissue at the C3 level should be ≤7 mm (approximately one-third the width of the adjacent cervical vertebral body) on a standard lateral cervical spine radiograph.

For an AP projection of the knee, the central ray is directed to which landmark?

Answer: 0.5 inch (1 cm) below the patellar apex

The central ray for an AP knee is directed to the knee joint, approximately 0.5 inch below the patellar apex.

Which projection of the chest is considered the standard for routine chest radiography?

Answer: PA erect

The PA erect projection is standard for chest radiography because it minimizes heart magnification and allows full lung expansion.

As kVp increases in diagnostic radiography, what generally happens to patient dose?

Answer: Patient dose decreases because higher energy photons penetrate more efficiently

Higher kVp photons penetrate tissue more efficiently (more Compton scatter, less photoelectric effect), reducing overall patient dose when mAs is adjusted accordingly.

In a quality management program, a control chart with data points outside the ±2 standard deviation range indicates:

Answer: A systematic process problem requiring investigation

Data points outside ±2 SD in a QC control chart trigger a warning (Westgard rules). Points outside ±3 SD or two consecutive points outside ±2 SD indicate process instability requiring investigation and corrective action before clinical use.

The heel effect in radiography refers to:

Answer: Reduced x-ray intensity on the anode side of the beam compared to the cathode side

The heel effect occurs because x-rays produced at depth within the anode must travel through more anode material when exiting toward the anode side, reducing their intensity on that side.

On a lateral lumbar spine radiograph, which structures are identified at the L4-L5 intervertebral disc level?

Answer: The intervertebral disc space between the fourth and fifth lumbar vertebral bodies and the posterior elements

The lateral lumbar spine radiograph demonstrates the L4-L5 disc space between the fourth and fifth lumbar vertebral bodies, surrounded by the vertebral endplates and posterior elements.

The gantry in a CT scanner houses the x-ray tube and detector array. The typical gantry rotation time for a modern CT scanner is:

Answer: 0.27–0.5 seconds per rotation

Modern CT scanners achieve gantry rotation times of approximately 0.27–0.5 seconds per 360° rotation, enabling rapid scanning and cardiac CT capability.

What does mAs represent in radiographic technique?

Answer: Milliampere-seconds, a measure of X-ray quantity

mAs (milliampere-seconds) is the product of tube current (mA) and exposure time (s), determining the total quantity of X-rays produced.

In computed radiography (CR), the image is captured by a photostimulable phosphor (PSP) plate. To read the image, the PSP plate is exposed to:

Answer: A laser beam that stimulates the stored energy to emit visible light

In CR, the PSP plate stores x-ray energy as trapped electrons; a laser beam stimulates these electrons, causing photostimulated luminescence (PSL) that is detected and converted to a digital image.

Which clinical parameter most directly affects the contrast resolution (ability to distinguish tissues of similar density) in CT imaging?

Answer: mAs (noise level)

Contrast resolution in CT is primarily determined by image noise, which is controlled by mAs. Higher mAs reduces noise and improves contrast resolution (ability to detect subtle density differences).