Echocardiogram Data Structures and Algorithms 3

Question 1

In speckle-tracking echocardiography, block-matching searches neighboring pixels to find the best-matching tissue pattern. What is the time complexity of an exhaustive block-matching search over a search window of n×n candidates?

Accepted Answer

O(n²)

Answer

Exhaustive block-matching evaluates every candidate position in the n×n search window, yielding O(n²) complexity.

Question 2

Which sorting algorithm is most suitable for real-time reordering of a nearly-sorted list of echocardiographic measurement timestamps arriving in slightly out-of-order bursts?

Accepted Answer

Insertion sort

Answer

Insertion sort runs in near O(n) time on nearly-sorted data, making it ideal for re-sorting small, almost-ordered timestamp lists in real time.

Question 3

A cardiac image archive indexes studies by patient ID and acquisition date. Which data structure supports efficient range queries such as 'retrieve all studies between two dates'?

Accepted Answer

Balanced binary search tree (e.g., B-tree)

Answer

Balanced BSTs and B-trees store keys in sorted order, enabling efficient O(log n) range queries by in-order traversal between bounds.

Question 4

Which graph traversal algorithm would most efficiently determine whether two anatomical landmarks on a segmented cardiac mesh are connected?

Accepted Answer

Breadth-first search (BFS)

Answer

BFS efficiently answers connectivity queries by exploring all reachable nodes level by level from one landmark until the other is found.

Question 5

When compressing a large batch of echocardiographic DICOM files for archival, lossless compression algorithms typically exploit which data property?

Accepted Answer

Redundancy and repeated patterns in the data

Answer

Lossless compression (e.g., RLE, Huffman) achieves size reduction by encoding repeated patterns and statistical redundancies in the data without discarding any information.

(Echocardiogram) Certified Echocardiogram Technician Practice Test

(Echocardiogram) Certified Echocardiogram Technician Practice Test

Echocardiogram Data Structures and Algorithms 3