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Radiographic Anatomy & Techniques

Oral Medicine & Radiology • NEET MDS Study Guide • AI-Generated Notes

⭐ High-Yield Facts for Exam

  • Paralleling = most accurate intraoral technique.
  • Bisecting angle → foreshortening/elongation errors.
  • OPG = most common extraoral view.
  • CBCT = 3D, implant gold standard.
  • kVp = contrast; mA = density.

Radiographic Anatomy & Techniques

Intraoral Techniques

  • Paralleling technique — film parallel to the long axis; the more accurate, less distortion.
  • Bisecting angle — central ray perpendicular to the bisector; prone to foreshortening/elongation with angulation errors.

Extraoral / Advanced

  • OPG (panoramic) — most common extraoral view; broad survey of both jaws.
  • CBCT — 3D imaging; the standard for implant planning and complex assessment.

Exposure Factors

kVp controls beam quality/contrast; mA (and time) controls quantity/density of the beam.

Exam Tips ⭐

Paralleling = most accurate; bisecting → foreshortening/elongation; CBCT = implant gold standard; kVp = contrast, mA = density.

📝 Practice MCQs — Radiographic Anatomy & Techniques

Q1. The most accurate intraoral radiographic technique is:
A. Bisecting angle
B. Paralleling
C. Occlusal
D. Bitewing only
Show Answer
✅ Answer: B
Paralleling minimises distortion and is more accurate.
Q2. kVp primarily controls radiographic:
A. Density
B. Contrast (beam quality)
C. Magnification
D. Sharpness
Show Answer
✅ Answer: B
kVp affects beam energy/quality and image contrast.
Q3. The imaging of choice for implant planning is:
A. Bitewing
B. OPG
C. CBCT
D. Occlusal
Show Answer
✅ Answer: C
CBCT provides 3D data for implant planning.
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